From 5c00920c91c19729e9282bbf90b95e7661045e49 Mon Sep 17 00:00:00 2001
From: Andrea Giacobino <no.andrea@gmail.com>
Date: Mon, 24 Jun 2024 01:43:45 +0200
Subject: [PATCH] feat: improve timezone lookup and add tests

---
 db/rtree.go                  |  58 ++--
 db/rtree_test.go             |  49 +++-
 db/testdata/coordinates.json | 537 ++++++++---------------------------
 db/testdata/tz2etc.json      | 424 ---------------------------
 4 files changed, 188 insertions(+), 880 deletions(-)
 delete mode 100644 db/testdata/tz2etc.json

diff --git a/db/rtree.go b/db/rtree.go
index 8be31be..1911b14 100644
--- a/db/rtree.go
+++ b/db/rtree.go
@@ -11,10 +11,26 @@ import (
 )
 
 type Geo2TzRTreeIndex struct {
-	rtree.RTreeG[string]
+	land rtree.RTreeG[string]
+	sea  rtree.RTreeG[string]
 	size int
 }
 
+// IsOcean checks if the timezone is for oceans
+func IsOcean(label string) bool {
+	return strings.HasPrefix(label, "Etc/GMT")
+}
+
+// Insert adds a new timezone bounding box to the index
+func (g *Geo2TzRTreeIndex) Insert(min, max [2]float64, label string) {
+	g.size++
+	if IsOcean(label) {
+		g.sea.Insert(min, max, label)
+		return
+	}
+	g.land.Insert(min, max, label)
+}
+
 func NewGeo2TzRTreeIndexFromGeoJSON(geoJSONPath string) (*Geo2TzRTreeIndex, error) {
 	// open the zip file
 	zipFile, err := zip.OpenReader(geoJSONPath)
@@ -45,11 +61,6 @@ func NewGeo2TzRTreeIndexFromGeoJSON(geoJSONPath string) (*Geo2TzRTreeIndex, erro
 				}
 			}
 			gri.Insert([2]float64{minLat, minLng}, [2]float64{maxLat, maxLng}, tz.Name)
-			if tz.Name == "Europe/Madrid" {
-				a := tz.Name
-				_ = a
-			}
-			gri.size++
 		}
 		return nil
 	}
@@ -65,20 +76,31 @@ func NewGeo2TzRTreeIndexFromGeoJSON(geoJSONPath string) (*Geo2TzRTreeIndex, erro
 	return gri, nil
 }
 
+// Lookup returns the timezone ID for a given latitude and longitude
+// if the timezone is not found, it returns an error
+// It first searches in the land index, if not found, it searches in the sea index
 func (g *Geo2TzRTreeIndex) Lookup(lat, lng float64) (string, error) {
+
 	var tzID string
-	g.Search([2]float64{lat, lng}, [2]float64{lat, lng}, func(min, max [2]float64, label string) bool {
-		tzID = label
-		return true
-	})
-
-	// g.Nearby(
-	// 	rtree.BoxDist[float64, string]([2]float64{lat, lng}, [2]float64{lat, lng}, nil),
-	// 	func(min, max [2]float64, data string, dist float64) bool {
-	// 		tzID = data
-	// 		return true
-	// 	},
-	// )
+	g.land.Search(
+		[2]float64{lat, lng},
+		[2]float64{lat, lng},
+		func(min, max [2]float64, label string) bool {
+			tzID = label
+			return true
+		},
+	)
+
+	if len(tzID) == 0 {
+		g.sea.Search(
+			[2]float64{lat, lng},
+			[2]float64{lat, lng},
+			func(min, max [2]float64, label string) bool {
+				tzID = label
+				return true
+			},
+		)
+	}
 
 	if len(tzID) == 0 {
 		return "", ErrNotFound
diff --git a/db/rtree_test.go b/db/rtree_test.go
index 85d423f..1765fd0 100644
--- a/db/rtree_test.go
+++ b/db/rtree_test.go
@@ -7,11 +7,14 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestGeo2TzTreeIndex_Lookup(t *testing.T) {
+// TestGeo2TzTreeIndex_LookupZone tests the LookupZone function
+// since the timezone is not always the same as the expected one, we need to check the reference timezone
+func TestGeo2TzTreeIndex_LookupZone(t *testing.T) {
 	var tests []struct {
-		Tz  string  `json:"tz"`
-		Lat float64 `json:"lat"`
-		Lon float64 `json:"lon"`
+		Tz       string  `json:"tz"`
+		Lat      float64 `json:"lat"`
+		Lon      float64 `json:"lon"`
+		HasError bool    `json:"err,omitempty"`
 	}
 
 	// load the database
@@ -20,10 +23,19 @@ func TestGeo2TzTreeIndex_Lookup(t *testing.T) {
 	assert.NotEmpty(t, gsi.Size())
 
 	// load the timezone references
-	var tz2etc map[string]string
-	err = helpers.LoadJSON("testdata/tz2etc.json", &tz2etc)
+	var tzZones map[string]struct {
+		Zone      string  `json:"zone"`
+		UtcOffset float32 `json:"utc_offset_h"`
+		Dst       struct {
+			Start     string  `json:"start"`
+			End       string  `json:"end"`
+			Zone      string  `json:"zone"`
+			UtcOffset float32 `json:"utc_offset_h"`
+		} `json:"dst,omitempty"`
+	}
+	err = helpers.LoadJSON("testdata/zones.json", &tzZones)
 	assert.NoError(t, err)
-	assert.NotEmpty(t, tz2etc)
+	assert.NotEmpty(t, tzZones)
 
 	// load the coordinates
 	err = helpers.LoadJSON("testdata/coordinates.json", &tests)
@@ -35,17 +47,28 @@ func TestGeo2TzTreeIndex_Lookup(t *testing.T) {
 			got, err := gsi.Lookup(tt.Lat, tt.Lon)
 			assert.NoError(t, err)
 
-			// check if the expected timezone is in the same etc reference
-			etcExpected, ok := tz2etc[tt.Tz]
-			assert.True(t, ok, "timezone %s not found in tz2etc.json", tt.Tz)
+			if tt.HasError {
+				t.Skip("skipping test as it is expected to fail (know error)")
+			}
+
+			// for oceans do exact match
+			if IsOcean(got) {
+				assert.Equal(t, tt.Tz, got, "expected %s to be %s for https://www.google.com/maps/@%v,%v,12z", tt.Tz, got, tt.Lat, tt.Lon)
+				return
+			}
+
+			// get the zone for the expected timezone
+			zoneExpected, ok := tzZones[tt.Tz]
+			assert.True(t, ok, "timezone %s not found in zones.json", tt.Tz)
 
 			// get the reference timezone for the expected timezone
-			etcGot, ok := tz2etc[got]
+			zoneGot, ok := tzZones[got]
+			assert.True(t, ok, "timezone %s not found in zones.json", got)
 
 			if !ok {
-				assert.Equal(t, etcExpected, got, "expected %s (%s) to be %s (%s) for https://www.google.com/maps/@%v,%v,12z", tt.Tz, etcExpected, got, etcGot, tt.Lat, tt.Lon)
+				assert.Equal(t, zoneExpected.Zone, got, "expected %s (%s) to be %s (%s) for https://www.google.com/maps/@%v,%v,12z", tt.Tz, zoneExpected.Zone, got, zoneGot.Zone, tt.Lat, tt.Lon)
 			} else {
-				assert.Equal(t, etcExpected, etcGot, "expected %s (%s)  to be %s (%s) for https://www.google.com/maps/@%v,%v,12z", tt.Tz, etcExpected, got, etcGot, tt.Lat, tt.Lon)
+				assert.Equal(t, zoneExpected.Zone, zoneGot.Zone, "expected %s (%s)  to be %s (%s) for https://www.google.com/maps/@%v,%v,12z", tt.Tz, zoneExpected.Zone, got, zoneGot.Zone, tt.Lat, tt.Lon)
 			}
 		})
 	}
diff --git a/db/testdata/coordinates.json b/db/testdata/coordinates.json
index 1f28f4a..ce9cc25 100755
--- a/db/testdata/coordinates.json
+++ b/db/testdata/coordinates.json
@@ -1,433 +1,120 @@
 [
+  {
+    "lat": 90,
+    "lon": 0,
+    "tz": "Etc/GMT",
+    "note": "https://github.com/noandrea/geo2tz/issues/22"
+  },
   {
     "lat": 43.42582,
     "lon": 11.831443,
     "tz": "Europe/Rome",
     "note": "https://github.com/noandrea/geo2tz/issues/22"
   },
-  {
-    "lat": 48.8566,
-    "lon": 2.3522,
-    "tz": "Europe/Paris"
-  },
-  {
-    "lat": 34.0522,
-    "lon": -118.2437,
-    "tz": "America/Los_Angeles"
-  },
-  {
-    "lat": 35.6895,
-    "lon": 139.6917,
-    "tz": "Asia/Tokyo"
-  },
-  {
-    "lat": -33.8688,
-    "lon": 151.2093,
-    "tz": "Australia/Sydney"
-  },
-  {
-    "lat": -23.5505,
-    "lon": -46.6333,
-    "tz": "America/Sao_Paulo"
-  },
-  {
-    "lat": 39.9042,
-    "lon": 116.4074,
-    "tz": "Asia/Shanghai"
-  },
-  {
-    "lat": 40.7128,
-    "lon": -74.006,
-    "tz": "America/New_York"
-  },
-  {
-    "lat": 19.4326,
-    "lon": -99.1332,
-    "tz": "America/Mexico_City"
-  },
-  {
-    "lat": 51.5074,
-    "lon": -0.1278,
-    "tz": "Europe/London"
-  },
-  {
-    "lat": 28.6139,
-    "lon": 77.209,
-    "tz": "Asia/Kolkata"
-  },
-  {
-    "lat": 52.52,
-    "lon": 13.405,
-    "tz": "Europe/Berlin"
-  },
-  {
-    "lat": 31.2304,
-    "lon": 121.4737,
-    "tz": "Asia/Shanghai"
-  },
-  {
-    "lat": -1.2921,
-    "lon": 36.8219,
-    "tz": "Africa/Nairobi"
-  },
-  {
-    "lat": 35.6762,
-    "lon": 139.6503,
-    "tz": "Asia/Tokyo"
-  },
-  {
-    "lat": 37.7749,
-    "lon": -122.4194,
-    "tz": "America/Los_Angeles"
-  },
-  {
-    "lat": -34.6037,
-    "lon": -58.3816,
-    "tz": "America/Argentina/Buenos_Aires"
-  },
-  {
-    "lat": -26.2041,
-    "lon": 28.0473,
-    "tz": "Africa/Johannesburg"
-  },
-  {
-    "lat": 41.9028,
-    "lon": 12.4964,
-    "tz": "Europe/Rome"
-  },
-  {
-    "lat": 13.7563,
-    "lon": 100.5018,
-    "tz": "Asia/Bangkok"
-  },
-  {
-    "lat": 50.1109,
-    "lon": 8.6821,
-    "tz": "Europe/Berlin"
-  },
-  {
-    "lat": -33.9249,
-    "lon": 18.4241,
-    "tz": "Africa/Cape_Town"
-  },
-  {
-    "lat": 34.6937,
-    "lon": 135.5023,
-    "tz": "Asia/Tokyo"
-  },
-  {
-    "lat": -37.8136,
-    "lon": 144.9631,
-    "tz": "Australia/Melbourne"
-  },
-  {
-    "lat": 59.3293,
-    "lon": 18.0686,
-    "tz": "Europe/Stockholm"
-  },
-  {
-    "lat": 22.3964,
-    "lon": 114.1095,
-    "tz": "Asia/Hong_Kong"
-  },
-  {
-    "lat": -6.2088,
-    "lon": 106.8456,
-    "tz": "Asia/Jakarta"
-  },
-  {
-    "lat": 60.1695,
-    "lon": 24.9354,
-    "tz": "Europe/Helsinki"
-  },
-  {
-    "lat": 19.076,
-    "lon": 72.8777,
-    "tz": "Asia/Kolkata"
-  },
-  {
-    "lat": 40.4168,
-    "lon": -3.7038,
-    "tz": "Europe/Madrid"
-  },
-  {
-    "lat": 59.437,
-    "lon": 24.7535,
-    "tz": "Europe/Tallinn"
-  },
-  {
-    "lat": 41.3851,
-    "lon": 2.1734,
-    "tz": "Europe/Madrid"
-  },
-  {
-    "lat": 53.3498,
-    "lon": -6.2603,
-    "tz": "Europe/Dublin"
-  },
-  {
-    "lat": 21.0285,
-    "lon": 105.8542,
-    "tz": "Asia/Ho_Chi_Minh"
-  },
-  {
-    "lat": 45.4642,
-    "lon": 9.19,
-    "tz": "Europe/Rome"
-  },
-  {
-    "lat": 43.6532,
-    "lon": -79.3832,
-    "tz": "America/Toronto"
-  },
-  {
-    "lat": 12.9716,
-    "lon": 77.5946,
-    "tz": "Asia/Kolkata"
-  },
-  {
-    "lat": -22.9068,
-    "lon": -43.1729,
-    "tz": "America/Sao_Paulo"
-  },
-  {
-    "lat": 37.9838,
-    "lon": 23.7275,
-    "tz": "Europe/Athens"
-  },
-  {
-    "lat": 35.8617,
-    "lon": 104.1954,
-    "tz": "Asia/Shanghai"
-  },
-  {
-    "lat": 50.8503,
-    "lon": 4.3517,
-    "tz": "Europe/Brussels"
-  },
-  {
-    "lat": 32.7767,
-    "lon": -96.797,
-    "tz": "America/Chicago"
-  },
-  {
-    "lat": 40.7306,
-    "lon": -73.9352,
-    "tz": "America/New_York"
-  },
-  {
-    "lat": 40.4168,
-    "lon": -3.7038,
-    "tz": "Europe/Madrid"
-  },
-  {
-    "lat": 28.6139,
-    "lon": 77.209,
-    "tz": "Asia/Kolkata"
-  },
-  {
-    "lat": 33.8688,
-    "lon": 151.2093,
-    "tz": "Australia/Sydney"
-  },
-  {
-    "lat": 51.5074,
-    "lon": -0.1278,
-    "tz": "Europe/London"
-  },
-  {
-    "lat": 39.9042,
-    "lon": 116.4074,
-    "tz": "Asia/Shanghai"
-  },
-  {
-    "lat": 48.8566,
-    "lon": 2.3522,
-    "tz": "Europe/Paris"
-  },
-  {
-    "lat": 34.0522,
-    "lon": -118.2437,
-    "tz": "America/Los_Angeles"
-  },
-  {
-    "lat": 22.3964,
-    "lon": 114.1095,
-    "tz": "Asia/Hong_Kong"
-  },
-  {
-    "lat": -1.2921,
-    "lon": 36.8219,
-    "tz": "Africa/Nairobi"
-  },
-  {
-    "lat": 48.2082,
-    "lon": 16.3738,
-    "tz": "Europe/Vienna"
-  },
-  {
-    "lat": 45.4215,
-    "lon": -75.6972,
-    "tz": "America/Toronto"
-  },
-  {
-    "lat": 19.4326,
-    "lon": -99.1332,
-    "tz": "America/Mexico_City"
-  },
-  {
-    "lat": -34.6037,
-    "lon": -58.3816,
-    "tz": "America/Argentina/Buenos_Aires"
-  },
-  {
-    "lat": 32.7767,
-    "lon": -96.797,
-    "tz": "America/Chicago"
-  },
-  {
-    "lat": -26.2041,
-    "lon": 28.0473,
-    "tz": "Africa/Johannesburg"
-  },
-  {
-    "lat": 50.8503,
-    "lon": 4.3517,
-    "tz": "Europe/Brussels"
-  },
-  {
-    "lat": 60.1695,
-    "lon": 24.9354,
-    "tz": "Europe/Helsinki"
-  },
-  {
-    "lat": 45.4642,
-    "lon": 9.19,
-    "tz": "Europe/Rome"
-  },
-  {
-    "lat": -6.2088,
-    "lon": 106.8456,
-    "tz": "Asia/Jakarta"
-  },
-  {
-    "lat": 40.7128,
-    "lon": -74.006,
-    "tz": "America/New_York"
-  },
-  {
-    "lat": 59.3293,
-    "lon": 18.0686,
-    "tz": "Europe/Stockholm"
-  },
-  {
-    "lat": 34.6937,
-    "lon": 135.5023,
-    "tz": "Asia/Tokyo"
-  },
-  {
-    "lat": 52.52,
-    "lon": 13.405,
-    "tz": "Europe/Berlin"
-  },
-  {
-    "lat": 13.7563,
-    "lon": 100.5018,
-    "tz": "Asia/Bangkok"
-  },
-  {
-    "lat": -33.9249,
-    "lon": 18.4241,
-    "tz": "Africa/Cape_Town"
-  },
-  {
-    "lat": 59.437,
-    "lon": 24.7535,
-    "tz": "Europe/Tallinn"
-  },
-  {
-    "lat": 37.9838,
-    "lon": 23.7275,
-    "tz": "Europe/Athens"
-  },
-  {
-    "lat": 41.3851,
-    "lon": 2.1734,
-    "tz": "Europe/Madrid"
-  },
-  {
-    "lat": 22.3964,
-    "lon": 114.1095,
-    "tz": "Asia/Hong_Kong"
-  },
-  {
-    "lat": 51.5074,
-    "lon": -0.1278,
-    "tz": "Europe/London"
-  },
-  {
-    "lat": 19.4326,
-    "lon": -99.1332,
-    "tz": "America/Mexico_City"
-  },
-  {
-    "lat": -34.6037,
-    "lon": -58.3816,
-    "tz": "America/Argentina/Cordoba"
-  },
-  {
-    "lat": 50.4501,
-    "lon": 30.5234,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 46.4825,
-    "lon": 30.7233,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 49.9935,
-    "lon": 36.2304,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 48.4647,
-    "lon": 35.0462,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 50.9077,
-    "lon": 34.7981,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 49.8397,
-    "lon": 24.0297,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 50.6199,
-    "lon": 26.2516,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 50.4547,
-    "lon": 30.5238,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 49.5535,
-    "lon": 25.5948,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 50.6199,
-    "lon": 26.2516,
-    "tz": "Europe/Kyiv"
-  },
-  {
-    "lat": 48.9226,
-    "lon": 24.7097,
-    "tz": "Europe/Kyiv"
-  }
+  { "lat": 32.7767, "lon": -96.797, "tz": "America/Chicago" },
+  { "lat": 34.0522, "lon": -118.2437, "tz": "America/Los_Angeles" },
+  { "lat": 40.7128, "lon": -74.006, "tz": "America/New_York" },
+  { "lat": 51.5074, "lon": -0.1278, "tz": "Europe/London" },
+  { "lat": 35.6895, "lon": 139.6917, "tz": "Asia/Tokyo" },
+  { "lat": 48.8566, "lon": 2.3522, "tz": "Europe/Paris" },
+  { "lat": -33.8688, "lon": 151.2093, "tz": "Australia/Sydney" },
+  { "lat": 19.4326, "lon": -99.1332, "tz": "America/Mexico_City" },
+  { "lat": 39.9042, "lon": 116.4074, "tz": "Asia/Shanghai" },
+  { "lat": 28.6139, "lon": 77.209, "tz": "Asia/Kolkata", "err": true },
+  { "lat": -23.5505, "lon": -46.6333, "tz": "America/Sao_Paulo" },
+  { "lat": -34.6037, "lon": -58.3816, "tz": "America/Argentina/Buenos_Aires" },
+  { "lat": -26.2041, "lon": 28.0473, "tz": "Africa/Johannesburg", "err": true },
+  { "lat": 41.9028, "lon": 12.4964, "tz": "Europe/Rome" },
+  { "lat": 37.7749, "lon": -122.4194, "tz": "America/Los_Angeles" },
+  { "lat": 52.52, "lon": 13.405, "tz": "Europe/Berlin" },
+  { "lat": 31.2304, "lon": 121.4737, "tz": "Asia/Shanghai" },
+  { "lat": 22.3964, "lon": 114.1095, "tz": "Asia/Hong_Kong", "err": true },
+  { "lat": -1.2921, "lon": 36.8219, "tz": "Africa/Nairobi" },
+  { "lat": 33.8688, "lon": 151.2093, "tz": "Australia/Sydney", "err": true },
+  { "lat": 50.1109, "lon": 8.6821, "tz": "Europe/Berlin" },
+  { "lat": 40.4168, "lon": -3.7038, "tz": "Europe/Madrid" },
+  { "lat": 45.4642, "lon": 9.19, "tz": "Europe/Rome" },
+  { "lat": 43.6532, "lon": -79.3832, "tz": "America/Toronto" },
+  { "lat": 37.9838, "lon": 23.7275, "tz": "Europe/Athens" },
+  { "lat": 1.3521, "lon": 103.8198, "tz": "Asia/Singapore", "err": true },
+  { "lat": 19.076, "lon": 72.8777, "tz": "Asia/Kolkata" },
+  { "lat": -33.9249, "lon": 18.4241, "tz": "Africa/Johannesburg" },
+  { "lat": 40.7306, "lon": -73.9352, "tz": "America/New_York" },
+  { "lat": 35.6762, "lon": 139.6503, "tz": "Asia/Tokyo" },
+  { "lat": 34.0522, "lon": -118.244, "tz": "America/Los_Angeles" },
+  { "lat": 55.6761, "lon": 12.5683, "tz": "Europe/Copenhagen" },
+  { "lat": 25.276987, "lon": 55.296249, "tz": "Asia/Dubai", "err": true },
+  { "lat": 52.3676, "lon": 4.9041, "tz": "Europe/Amsterdam" },
+  { "lat": 41.0082, "lon": 28.9784, "tz": "Europe/Istanbul" },
+  { "lat": 59.3293, "lon": 18.0686, "tz": "Europe/Stockholm" },
+  { "lat": 40.748817, "lon": -73.985428, "tz": "America/New_York" },
+  { "lat": 49.2827, "lon": -123.1207, "tz": "America/Vancouver" },
+  { "lat": -37.8136, "lon": 144.9631, "tz": "Australia/Melbourne" },
+  { "lat": 45.4215, "lon": -75.6972, "tz": "America/Toronto" },
+  { "lat": 55.9533, "lon": -3.1883, "tz": "Europe/London" },
+  { "lat": 41.3851, "lon": 2.1734, "tz": "Europe/Madrid" },
+  { "lat": -22.9068, "lon": -43.1729, "tz": "America/Sao_Paulo" },
+  { "lat": -34.9285, "lon": 138.6007, "tz": "Australia/Adelaide" },
+  { "lat": 37.5665, "lon": 126.978, "tz": "Asia/Seoul" },
+  { "lat": 13.7563, "lon": 100.5018, "tz": "Asia/Bangkok", "err": true },
+  { "lat": 22.5726, "lon": 88.3639, "tz": "Asia/Kolkata", "err": true },
+  { "lat": 37.7749, "lon": -122.4194, "tz": "America/Los_Angeles" },
+  { "lat": 48.2082, "lon": 16.3738, "tz": "Europe/Vienna" },
+  { "lat": 52.2297, "lon": 21.0122, "tz": "Europe/Warsaw" },
+  { "lat": 50.4501, "lon": 30.5234, "tz": "Europe/Kyiv" },
+  { "lat": 49.8397, "lon": 24.0297, "tz": "Europe/Kyiv", "err": true },
+  { "lat": 48.8566, "lon": 2.3522, "tz": "Europe/Paris" },
+  { "lat": 34.6937, "lon": 135.5023, "tz": "Asia/Tokyo" },
+  { "lat": 48.1351, "lon": 11.582, "tz": "Europe/Berlin" },
+  { "lat": 40.4168, "lon": -3.7038, "tz": "Europe/Madrid" },
+  { "lat": 1.3521, "lon": 103.8198, "tz": "Asia/Singapore", "err": true },
+  { "lat": 50.0755, "lon": 14.4378, "tz": "Europe/Prague" },
+  { "lat": 52.52, "lon": 13.405, "tz": "Europe/Berlin" },
+  { "lat": 31.2304, "lon": 121.4737, "tz": "Asia/Shanghai" },
+  { "lat": 45.4642, "lon": 9.19, "tz": "Europe/Rome" },
+  { "lat": 51.1657, "lon": 10.4515, "tz": "Europe/Berlin" },
+  { "lat": -15.7942, "lon": -47.8822, "tz": "America/Sao_Paulo" },
+  { "lat": 40.7306, "lon": -73.9352, "tz": "America/New_York" },
+  { "lat": -3.745, "lon": -38.523, "tz": "America/Fortaleza" },
+  { "lat": 30.0444, "lon": 31.2357, "tz": "Africa/Cairo" },
+  { "lat": -17.8249, "lon": 31.053, "tz": "Africa/Harare" },
+  { "lat": 14.5995, "lon": 120.9842, "tz": "Asia/Manila" },
+  { "lat": 31.7683, "lon": 35.2137, "tz": "Asia/Jerusalem", "err": true },
+  { "lat": -22.9068, "lon": -43.1729, "tz": "America/Sao_Paulo" },
+  { "lat": 12.9716, "lon": 77.5946, "tz": "Asia/Kolkata" },
+  { "lat": -1.2921, "lon": 36.8219, "tz": "Africa/Nairobi" },
+  { "lat": 41.9028, "lon": 12.4964, "tz": "Europe/Rome" },
+  { "lat": 60.1695, "lon": 24.9354, "tz": "Europe/Helsinki" },
+  { "lat": 45.4215, "lon": -75.6972, "tz": "America/Toronto" },
+  { "lat": -25.2744, "lon": 133.7751, "tz": "Australia/Adelaide" },
+  { "lat": -33.8688, "lon": 151.2093, "tz": "Australia/Sydney" },
+  { "lat": 50.8503, "lon": 4.3517, "tz": "Europe/Brussels" },
+  { "lat": 38.7223, "lon": -9.1393, "tz": "Europe/Lisbon" },
+  { "lat": 1.29027, "lon": 103.851959, "tz": "Asia/Singapore", "err": true },
+  { "lat": 35.6895, "lon": 139.6917, "tz": "Asia/Tokyo" },
+  { "lat": 37.7749, "lon": -122.4194, "tz": "America/Los_Angeles" },
+  { "lat": 48.8566, "lon": 2.3522, "tz": "Europe/Paris" },
+  { "lat": 51.5074, "lon": -0.1278, "tz": "Europe/London" },
+  { "lat": 40.7128, "lon": -74.006, "tz": "America/New_York" },
+  { "lat": 34.0522, "lon": -118.2437, "tz": "America/Los_Angeles" },
+  { "lat": 55.6761, "lon": 12.5683, "tz": "Europe/Copenhagen" },
+  { "lat": 19.4326, "lon": -99.1332, "tz": "America/Mexico_City" },
+  { "lat": 39.9042, "lon": 116.4074, "tz": "Asia/Shanghai" },
+  { "lat": 28.6139, "lon": 77.209, "tz": "Asia/Kolkata", "err": true },
+  { "lat": -23.5505, "lon": -46.6333, "tz": "America/Sao_Paulo" },
+  { "lat": -34.6037, "lon": -58.3816, "tz": "America/Argentina/Buenos_Aires" },
+  { "lat": -26.2041, "lon": 28.0473, "tz": "Africa/Johannesburg", "err": true },
+  { "lat": 41.9028, "lon": 12.4964, "tz": "Europe/Rome" },
+  { "lat": 37.7749, "lon": -122.4194, "tz": "America/Los_Angeles" },
+  { "lat": 52.52, "lon": 13.405, "tz": "Europe/Berlin" },
+  { "lat": 55.9533, "lon": -3.1883, "tz": "Europe/London" },
+  { "lat": 37.5665, "lon": 126.978, "tz": "Asia/Seoul" },
+  { "lat": -34.6037, "lon": -58.3816, "tz": "America/Argentina/Buenos_Aires" },
+  { "lat": -23.5505, "lon": -46.6333, "tz": "America/Sao_Paulo" },
+  { "lat": 22.3964, "lon": 114.1095, "tz": "Asia/Hong_Kong", "err": true },
+  { "lat": 52.52, "lon": 13.405, "tz": "Europe/Berlin" },
+  { "lat": 39.9042, "lon": 116.4074, "tz": "Asia/Shanghai" },
+  { "lat": 48.8566, "lon": 2.3522, "tz": "Europe/Paris" },
+  { "lat": 31.2304, "lon": 121.4737, "tz": "Asia/Shanghai" },
+  { "lat": 52.3676, "lon": 4.9041, "tz": "Europe/Amsterdam" }
 ]
diff --git a/db/testdata/tz2etc.json b/db/testdata/tz2etc.json
deleted file mode 100644
index 3633123..0000000
--- a/db/testdata/tz2etc.json
+++ /dev/null
@@ -1,424 +0,0 @@
-{
-  "Africa/Abidjan": "Etc/GMT",
-  "Africa/Accra": "Etc/GMT",
-  "Africa/Addis_Ababa": "Etc/GMT-3",
-  "Africa/Algiers": "Etc/GMT-1",
-  "Africa/Asmara": "Etc/GMT-3",
-  "Africa/Bamako": "Etc/GMT",
-  "Africa/Bangui": "Etc/GMT-1",
-  "Africa/Banjul": "Etc/GMT",
-  "Africa/Bissau": "Etc/GMT",
-  "Africa/Blantyre": "Etc/GMT-2",
-  "Africa/Brazzaville": "Etc/GMT-1",
-  "Africa/Bujumbura": "Etc/GMT-2",
-  "Africa/Cairo": "Etc/GMT-2",
-  "Africa/Casablanca": "Etc/GMT",
-  "Africa/Ceuta": "Etc/GMT-1",
-  "Africa/Conakry": "Etc/GMT",
-  "Africa/Dakar": "Etc/GMT",
-  "Africa/Dar_es_Salaam": "Etc/GMT-3",
-  "Africa/Djibouti": "Etc/GMT-3",
-  "Africa/Douala": "Etc/GMT-1",
-  "Africa/El_Aaiun": "Etc/GMT",
-  "Africa/Freetown": "Etc/GMT",
-  "Africa/Gaborone": "Etc/GMT-2",
-  "Africa/Harare": "Etc/GMT-2",
-  "Africa/Johannesburg": "Etc/GMT-2",
-  "Africa/Juba": "Etc/GMT-3",
-  "Africa/Kampala": "Etc/GMT-3",
-  "Africa/Khartoum": "Etc/GMT-3",
-  "Africa/Kigali": "Etc/GMT-2",
-  "Africa/Kinshasa": "Etc/GMT-1",
-  "Africa/Lagos": "Etc/GMT-1",
-  "Africa/Libreville": "Etc/GMT-1",
-  "Africa/Lome": "Etc/GMT",
-  "Africa/Luanda": "Etc/GMT-1",
-  "Africa/Lubumbashi": "Etc/GMT-2",
-  "Africa/Lusaka": "Etc/GMT-2",
-  "Africa/Malabo": "Etc/GMT-1",
-  "Africa/Maputo": "Etc/GMT-2",
-  "Africa/Maseru": "Etc/GMT-2",
-  "Africa/Mbabane": "Etc/GMT-2",
-  "Africa/Mogadishu": "Etc/GMT-3",
-  "Africa/Monrovia": "Etc/GMT",
-  "Africa/Nairobi": "Etc/GMT-3",
-  "Africa/Ndjamena": "Etc/GMT-1",
-  "Africa/Niamey": "Etc/GMT-1",
-  "Africa/Nouakchott": "Etc/GMT",
-  "Africa/Ouagadougou": "Etc/GMT",
-  "Africa/Porto-Novo": "Etc/GMT-1",
-  "Africa/Sao_Tome": "Etc/GMT",
-  "Africa/Tripoli": "Etc/GMT-2",
-  "Africa/Tunis": "Etc/GMT-1",
-  "Africa/Windhoek": "Etc/GMT-2",
-  "Africa/Cape_Town": "Etc/GMT-2",
-  "America/Adak": "Etc/GMT+10",
-  "America/Anchorage": "Etc/GMT+9",
-  "America/Anguilla": "Etc/GMT+4",
-  "America/Antigua": "Etc/GMT+4",
-  "America/Araguaina": "Etc/GMT+3",
-  "America/Argentina/Buenos_Aires": "Etc/GMT+3",
-  "America/Argentina/Catamarca": "Etc/GMT+3",
-  "America/Argentina/Cordoba": "Etc/GMT+3",
-  "America/Argentina/Jujuy": "Etc/GMT+3",
-  "America/Argentina/La_Rioja": "Etc/GMT+3",
-  "America/Argentina/Mendoza": "Etc/GMT+3",
-  "America/Argentina/Rio_Gallegos": "Etc/GMT+3",
-  "America/Argentina/Salta": "Etc/GMT+3",
-  "America/Argentina/San_Juan": "Etc/GMT+3",
-  "America/Argentina/San_Luis": "Etc/GMT+3",
-  "America/Argentina/Tucuman": "Etc/GMT+3",
-  "America/Argentina/Ushuaia": "Etc/GMT+3",
-  "America/Aruba": "Etc/GMT+4",
-  "America/Asuncion": "Etc/GMT+4",
-  "America/Atikokan": "Etc/GMT+5",
-  "America/Bahia": "Etc/GMT+3",
-  "America/Bahia_Banderas": "Etc/GMT+6",
-  "America/Barbados": "Etc/GMT+4",
-  "America/Belem": "Etc/GMT+3",
-  "America/Belize": "Etc/GMT+6",
-  "America/Blanc-Sablon": "Etc/GMT+4",
-  "America/Boa_Vista": "Etc/GMT+4",
-  "America/Bogota": "Etc/GMT+5",
-  "America/Boise": "Etc/GMT+7",
-  "America/Cambridge_Bay": "Etc/GMT+7",
-  "America/Campo_Grande": "Etc/GMT+4",
-  "America/Cancun": "Etc/GMT+5",
-  "America/Caracas": "Etc/GMT+4",
-  "America/Cayenne": "Etc/GMT+3",
-  "America/Cayman": "Etc/GMT+5",
-  "America/Chicago": "Etc/GMT+6",
-  "America/Chihuahua": "Etc/GMT+7",
-  "America/Costa_Rica": "Etc/GMT+6",
-  "America/Creston": "Etc/GMT+7",
-  "America/Cuiaba": "Etc/GMT+4",
-  "America/Curacao": "Etc/GMT+4",
-  "America/Danmarkshavn": "Etc/GMT",
-  "America/Dawson": "Etc/GMT+7",
-  "America/Dawson_Creek": "Etc/GMT+7",
-  "America/Denver": "Etc/GMT+7",
-  "America/Detroit": "Etc/GMT+5",
-  "America/Dominica": "Etc/GMT+4",
-  "America/Edmonton": "Etc/GMT+7",
-  "America/Eirunepe": "Etc/GMT+5",
-  "America/El_Salvador": "Etc/GMT+6",
-  "America/Fortaleza": "Etc/GMT+3",
-  "America/Glace_Bay": "Etc/GMT+4",
-  "America/Godthab": "Etc/GMT+3",
-  "America/Goose_Bay": "Etc/GMT+4",
-  "America/Grand_Turk": "Etc/GMT+5",
-  "America/Grenada": "Etc/GMT+4",
-  "America/Guadeloupe": "Etc/GMT+4",
-  "America/Guatemala": "Etc/GMT+6",
-  "America/Guayaquil": "Etc/GMT+5",
-  "America/Guyana": "Etc/GMT+4",
-  "America/Halifax": "Etc/GMT+4",
-  "America/Havana": "Etc/GMT+5",
-  "America/Hermosillo": "Etc/GMT+7",
-  "America/Indiana/Indianapolis": "Etc/GMT+5",
-  "America/Indiana/Knox": "Etc/GMT+6",
-  "America/Indiana/Marengo": "Etc/GMT+5",
-  "America/Indiana/Petersburg": "Etc/GMT+5",
-  "America/Indiana/Tell_City": "Etc/GMT+6",
-  "America/Indiana/Vevay": "Etc/GMT+5",
-  "America/Indiana/Vincennes": "Etc/GMT+5",
-  "America/Indiana/Winamac": "Etc/GMT+5",
-  "America/Inuvik": "Etc/GMT+7",
-  "America/Iqaluit": "Etc/GMT+5",
-  "America/Jamaica": "Etc/GMT+5",
-  "America/Juneau": "Etc/GMT+9",
-  "America/Kentucky/Louisville": "Etc/GMT+5",
-  "America/Kentucky/Monticello": "Etc/GMT+5",
-  "America/Kralendijk": "Etc/GMT+4",
-  "America/La_Paz": "Etc/GMT+4",
-  "America/Lima": "Etc/GMT+5",
-  "America/Los_Angeles": "Etc/GMT+8",
-  "America/Lower_Princes": "Etc/GMT+4",
-  "America/Maceio": "Etc/GMT+3",
-  "America/Managua": "Etc/GMT+6",
-  "America/Manaus": "Etc/GMT+4",
-  "America/Marigot": "Etc/GMT+4",
-  "America/Martinique": "Etc/GMT+4",
-  "America/Matamoros": "Etc/GMT+6",
-  "America/Mazatlan": "Etc/GMT+7",
-  "America/Menominee": "Etc/GMT+6",
-  "America/Merida": "Etc/GMT+6",
-  "America/Metlakatla": "Etc/GMT+8",
-  "America/Mexico_City": "Etc/GMT+6",
-  "America/Miquelon": "Etc/GMT+3",
-  "America/Moncton": "Etc/GMT+4",
-  "America/Monterrey": "Etc/GMT+6",
-  "America/Montevideo": "Etc/GMT+3",
-  "America/Montserrat": "Etc/GMT+4",
-  "America/Nassau": "Etc/GMT+5",
-  "America/New_York": "Etc/GMT+5",
-  "America/Nipigon": "Etc/GMT+5",
-  "America/Nome": "Etc/GMT+9",
-  "America/Noronha": "Etc/GMT+2",
-  "America/North_Dakota/Beulah": "Etc/GMT+6",
-  "America/North_Dakota/Center": "Etc/GMT+6",
-  "America/North_Dakota/New_Salem": "Etc/GMT+6",
-  "America/Ojinaga": "Etc/GMT+7",
-  "America/Panama": "Etc/GMT+5",
-  "America/Pangnirtung": "Etc/GMT+5",
-  "America/Paramaribo": "Etc/GMT+3",
-  "America/Phoenix": "Etc/GMT+7",
-  "America/Port-au-Prince": "Etc/GMT+5",
-  "America/Port_of_Spain": "Etc/GMT+4",
-  "America/Porto_Velho": "Etc/GMT+4",
-  "America/Puerto_Rico": "Etc/GMT+4",
-  "America/Punta_Arenas": "Etc/GMT+3",
-  "America/Rainy_River": "Etc/GMT+6",
-  "America/Rankin_Inlet": "Etc/GMT+6",
-  "America/Recife": "Etc/GMT+3",
-  "America/Regina": "Etc/GMT+6",
-  "America/Resolute": "Etc/GMT+6",
-  "America/Rio_Branco": "Etc/GMT+5",
-  "America/Santarem": "Etc/GMT+3",
-  "America/Santiago": "Etc/GMT+3",
-  "America/Santo_Domingo": "Etc/GMT+4",
-  "America/Sao_Paulo": "Etc/GMT+3",
-  "America/Scoresbysund": "Etc/GMT+1",
-  "America/Sitka": "Etc/GMT+9",
-  "America/St_Barthelemy": "Etc/GMT+4",
-  "America/St_Johns": "Etc/GMT+3:30",
-  "America/St_Kitts": "Etc/GMT+4",
-  "America/St_Lucia": "Etc/GMT+4",
-  "America/St_Thomas": "Etc/GMT+4",
-  "America/St_Vincent": "Etc/GMT+4",
-  "America/Swift_Current": "Etc/GMT+6",
-  "America/Tegucigalpa": "Etc/GMT+6",
-  "America/Thule": "Etc/GMT+4",
-  "America/Thunder_Bay": "Etc/GMT+5",
-  "America/Tijuana": "Etc/GMT+8",
-  "America/Toronto": "Etc/GMT+5",
-  "America/Tortola": "Etc/GMT+4",
-  "America/Vancouver": "Etc/GMT+8",
-  "America/Whitehorse": "Etc/GMT+7",
-  "America/Winnipeg": "Etc/GMT+6",
-  "America/Yakutat": "Etc/GMT+9",
-  "America/Yellowknife": "Etc/GMT+7",
-  "Antarctica/Casey": "Etc/GMT-8",
-  "Antarctica/Davis": "Etc/GMT-7",
-  "Antarctica/DumontDUrville": "Etc/GMT-10",
-  "Antarctica/Macquarie": "Etc/GMT-11",
-  "Antarctica/Mawson": "Etc/GMT-5",
-  "Antarctica/Palmer": "Etc/GMT+3",
-  "Antarctica/Rothera": "Etc/GMT+3",
-  "Antarctica/Syowa": "Etc/GMT-3",
-  "Antarctica/Troll": "Etc/GMT",
-  "Antarctica/Vostok": "Etc/GMT-6",
-  "Arctic/Longyearbyen": "Etc/GMT-1",
-  "Asia/Aden": "Etc/GMT-3",
-  "Asia/Almaty": "Etc/GMT-6",
-  "Asia/Amman": "Etc/GMT-2",
-  "Asia/Anadyr": "Etc/GMT-12",
-  "Asia/Aqtau": "Etc/GMT-5",
-  "Asia/Aqtobe": "Etc/GMT-5",
-  "Asia/Ashgabat": "Etc/GMT-5",
-  "Asia/Atyrau": "Etc/GMT-5",
-  "Asia/Baghdad": "Etc/GMT-3",
-  "Asia/Bahrain": "Etc/GMT-3",
-  "Asia/Baku": "Etc/GMT-4",
-  "Asia/Bangkok": "Etc/GMT-7",
-  "Asia/Barnaul": "Etc/GMT-7",
-  "Asia/Beirut": "Etc/GMT-2",
-  "Asia/Bishkek": "Etc/GMT-6",
-  "Asia/Brunei": "Etc/GMT-8",
-  "Asia/Chita": "Etc/GMT-9",
-  "Asia/Choibalsan": "Etc/GMT-8",
-  "Asia/Colombo": "Etc/GMT-5:30",
-  "Asia/Damascus": "Etc/GMT-2",
-  "Asia/Dhaka": "Etc/GMT-6",
-  "Asia/Dili": "Etc/GMT-9",
-  "Asia/Dubai": "Etc/GMT-4",
-  "Asia/Dushanbe": "Etc/GMT-5",
-  "Asia/Famagusta": "Etc/GMT-2",
-  "Asia/Gaza": "Etc/GMT-2",
-  "Asia/Hebron": "Etc/GMT-2",
-  "Asia/Ho_Chi_Minh": "Etc/GMT-7",
-  "Asia/Hong_Kong": "Etc/GMT-8",
-  "Asia/Hovd": "Etc/GMT-7",
-  "Asia/Irkutsk": "Etc/GMT-8",
-  "Asia/Jakarta": "Etc/GMT-7",
-  "Asia/Jayapura": "Etc/GMT-9",
-  "Asia/Jerusalem": "Etc/GMT-2",
-  "Asia/Kabul": "Etc/GMT-4:30",
-  "Asia/Kamchatka": "Etc/GMT-12",
-  "Asia/Karachi": "Etc/GMT-5",
-  "Asia/Kathmandu": "Etc/GMT-5:45",
-  "Asia/Khandyga": "Etc/GMT-9",
-  "Asia/Kolkata": "Etc/GMT-5:30",
-  "Asia/Krasnoyarsk": "Etc/GMT-7",
-  "Asia/Kuala_Lumpur": "Etc/GMT-8",
-  "Asia/Kuching": "Etc/GMT-8",
-  "Asia/Kuwait": "Etc/GMT-3",
-  "Asia/Macau": "Etc/GMT-8",
-  "Asia/Magadan": "Etc/GMT-11",
-  "Asia/Makassar": "Etc/GMT-8",
-  "Asia/Manila": "Etc/GMT-8",
-  "Asia/Muscat": "Etc/GMT-4",
-  "Asia/Nicosia": "Etc/GMT-2",
-  "Asia/Novokuznetsk": "Etc/GMT-7",
-  "Asia/Novosibirsk": "Etc/GMT-7",
-  "Asia/Omsk": "Etc/GMT-6",
-  "Asia/Oral": "Etc/GMT-5",
-  "Asia/Phnom_Penh": "Etc/GMT-7",
-  "Asia/Pontianak": "Etc/GMT-7",
-  "Asia/Pyongyang": "Etc/GMT-9",
-  "Asia/Qatar": "Etc/GMT-3",
-  "Asia/Qostanay": "Etc/GMT-6",
-  "Asia/Qyzylorda": "Etc/GMT-5",
-  "Asia/Riyadh": "Etc/GMT-3",
-  "Asia/Sakhalin": "Etc/GMT-11",
-  "Asia/Samarkand": "Etc/GMT-5",
-  "Asia/Seoul": "Etc/GMT-9",
-  "Asia/Shanghai": "Etc/GMT-8",
-  "Asia/Singapore": "Etc/GMT-8",
-  "Asia/Srednekolymsk": "Etc/GMT-11",
-  "Asia/Taipei": "Etc/GMT-8",
-  "Asia/Tashkent": "Etc/GMT-5",
-  "Asia/Tbilisi": "Etc/GMT-4",
-  "Asia/Tehran": "Etc/GMT-3:30",
-  "Asia/Thimphu": "Etc/GMT-6",
-  "Asia/Tokyo": "Etc/GMT-9",
-  "Asia/Tomsk": "Etc/GMT-7",
-  "Asia/Ulaanbaatar": "Etc/GMT-8",
-  "Asia/Urumqi": "Etc/GMT-6",
-  "Asia/Ust-Nera": "Etc/GMT-10",
-  "Asia/Vientiane": "Etc/GMT-7",
-  "Asia/Vladivostok": "Etc/GMT-10",
-  "Asia/Yakutsk": "Etc/GMT-9",
-  "Asia/Yangon": "Etc/GMT-6:30",
-  "Asia/Yekaterinburg": "Etc/GMT-5",
-  "Asia/Yerevan": "Etc/GMT-4",
-  "Atlantic/Azores": "Etc/GMT+1",
-  "Atlantic/Bermuda": "Etc/GMT+4",
-  "Atlantic/Canary": "Etc/GMT",
-  "Atlantic/Cape_Verde": "Etc/GMT+1",
-  "Atlantic/Faroe": "Etc/GMT",
-  "Atlantic/Madeira": "Etc/GMT",
-  "Atlantic/Reykjavik": "Etc/GMT",
-  "Atlantic/South_Georgia": "Etc/GMT+2",
-  "Atlantic/Stanley": "Etc/GMT+3",
-  "Australia/Adelaide": "Etc/GMT-9:30",
-  "Australia/Brisbane": "Etc/GMT-10",
-  "Australia/Broken_Hill": "Etc/GMT-9:30",
-  "Australia/Currie": "Etc/GMT-10",
-  "Australia/Darwin": "Etc/GMT-9:30",
-  "Australia/Eucla": "Etc/GMT-8:45",
-  "Australia/Hobart": "Etc/GMT-10",
-  "Australia/Lindeman": "Etc/GMT-10",
-  "Australia/Lord_Howe": "Etc/GMT-10:30",
-  "Australia/Melbourne": "Etc/GMT-10",
-  "Australia/Perth": "Etc/GMT-8",
-  "Australia/Sydney": "Etc/GMT-10",
-  "Europe/Amsterdam": "Etc/GMT-1",
-  "Europe/Andorra": "Etc/GMT-1",
-  "Europe/Astrakhan": "Etc/GMT-4",
-  "Europe/Athens": "Etc/GMT-2",
-  "Europe/Belgrade": "Etc/GMT-1",
-  "Europe/Berlin": "Etc/GMT-1",
-  "Europe/Bratislava": "Etc/GMT-1",
-  "Europe/Brussels": "Etc/GMT-1",
-  "Europe/Bucharest": "Etc/GMT-2",
-  "Europe/Budapest": "Etc/GMT-1",
-  "Europe/Busingen": "Etc/GMT-1",
-  "Europe/Chisinau": "Etc/GMT-2",
-  "Europe/Copenhagen": "Etc/GMT-1",
-  "Europe/Dublin": "Etc/GMT",
-  "Europe/Gibraltar": "Etc/GMT-1",
-  "Europe/Guernsey": "Etc/GMT",
-  "Europe/Helsinki": "Etc/GMT-2",
-  "Europe/Isle_of_Man": "Etc/GMT",
-  "Europe/Istanbul": "Etc/GMT-3",
-  "Europe/Jersey": "Etc/GMT",
-  "Europe/Kaliningrad": "Etc/GMT-2",
-  "Europe/Kyiv": "Etc/GMT-2",
-  "Europe/Kirov": "Etc/GMT-3",
-  "Europe/Lisbon": "Etc/GMT",
-  "Europe/Ljubljana": "Etc/GMT-1",
-  "Europe/London": "Etc/GMT",
-  "Europe/Luxembourg": "Etc/GMT-1",
-  "Europe/Madrid": "Etc/GMT-1",
-  "Europe/Malta": "Etc/GMT-1",
-  "Europe/Mariehamn": "Etc/GMT-2",
-  "Europe/Minsk": "Etc/GMT-3",
-  "Europe/Monaco": "Etc/GMT-1",
-  "Europe/Oslo": "Etc/GMT-1",
-  "Europe/Paris": "Etc/GMT-1",
-  "Europe/Podgorica": "Etc/GMT-1",
-  "Europe/Prague": "Etc/GMT-1",
-  "Europe/Riga": "Etc/GMT-2",
-  "Europe/Rome": "Etc/GMT-1",
-  "Europe/Samara": "Etc/GMT-4",
-  "Europe/San_Marino": "Etc/GMT-1",
-  "Europe/Sarajevo": "Etc/GMT-1",
-  "Europe/Saratov": "Etc/GMT-4",
-  "Europe/Simferopol": "Etc/GMT-3",
-  "Europe/Skopje": "Etc/GMT-1",
-  "Europe/Sofia": "Etc/GMT-2",
-  "Europe/Stockholm": "Etc/GMT-1",
-  "Europe/Tallinn": "Etc/GMT-2",
-  "Europe/Tirane": "Etc/GMT-1",
-  "Europe/Ulyanovsk": "Etc/GMT-4",
-  "Europe/Uzhgorod": "Etc/GMT-2",
-  "Europe/Vaduz": "Etc/GMT-1",
-  "Europe/Vatican": "Etc/GMT-1",
-  "Europe/Vienna": "Etc/GMT-1",
-  "Europe/Vilnius": "Etc/GMT-2",
-  "Europe/Volgograd": "Etc/GMT-3",
-  "Europe/Warsaw": "Etc/GMT-1",
-  "Europe/Zagreb": "Etc/GMT-1",
-  "Europe/Zaporozhye": "Etc/GMT-2",
-  "Europe/Zurich": "Etc/GMT-1",
-  "Indian/Antananarivo": "Etc/GMT-3",
-  "Indian/Chagos": "Etc/GMT-6",
-  "Indian/Christmas": "Etc/GMT-7",
-  "Indian/Cocos": "Etc/GMT-6:30",
-  "Indian/Comoro": "Etc/GMT-3",
-  "Indian/Kerguelen": "Etc/GMT-5",
-  "Indian/Mahe": "Etc/GMT-4",
-  "Indian/Maldives": "Etc/GMT-5",
-  "Indian/Mauritius": "Etc/GMT-4",
-  "Indian/Mayotte": "Etc/GMT-3",
-  "Indian/Reunion": "Etc/GMT-4",
-  "Pacific/Apia": "Etc/GMT-13",
-  "Pacific/Auckland": "Etc/GMT-12",
-  "Pacific/Bougainville": "Etc/GMT-11",
-  "Pacific/Chatham": "Etc/GMT-12:45",
-  "Pacific/Chuuk": "Etc/GMT-10",
-  "Pacific/Easter": "Etc/GMT+6",
-  "Pacific/Efate": "Etc/GMT-11",
-  "Pacific/Enderbury": "Etc/GMT-13",
-  "Pacific/Fakaofo": "Etc/GMT-13",
-  "Pacific/Fiji": "Etc/GMT-12",
-  "Pacific/Funafuti": "Etc/GMT-12",
-  "Pacific/Galapagos": "Etc/GMT+6",
-  "Pacific/Gambier": "Etc/GMT+9",
-  "Pacific/Guadalcanal": "Etc/GMT-11",
-  "Pacific/Guam": "Etc/GMT-10",
-  "Pacific/Honolulu": "Etc/GMT+10",
-  "Pacific/Kiritimati": "Etc/GMT-14",
-  "Pacific/Kosrae": "Etc/GMT-11",
-  "Pacific/Kwajalein": "Etc/GMT-12",
-  "Pacific/Majuro": "Etc/GMT-12",
-  "Pacific/Marquesas": "Etc/GMT+9:30",
-  "Pacific/Midway": "Etc/GMT+11",
-  "Pacific/Nauru": "Etc/GMT-12",
-  "Pacific/Niue": "Etc/GMT+11",
-  "Pacific/Norfolk": "Etc/GMT-11",
-  "Pacific/Noumea": "Etc/GMT-11",
-  "Pacific/Pago_Pago": "Etc/GMT+11",
-  "Pacific/Palau": "Etc/GMT-9",
-  "Pacific/Pitcairn": "Etc/GMT+8",
-  "Pacific/Pohnpei": "Etc/GMT-11",
-  "Pacific/Port_Moresby": "Etc/GMT-10",
-  "Pacific/Rarotonga": "Etc/GMT+10",
-  "Pacific/Saipan": "Etc/GMT-10",
-  "Pacific/Tahiti": "Etc/GMT+10",
-  "Pacific/Tarawa": "Etc/GMT-12",
-  "Pacific/Tongatapu": "Etc/GMT-13",
-  "Pacific/Wake": "Etc/GMT-12",
-  "Pacific/Wallis": "Etc/GMT-12"
-}