fix: pad ns correctly (#41)

The nanosecond component of a RFC3339 date should be nine characters long and padded at the front with 0s.

src/utils.ts

@@ -10,7 +10,7 @@ export function toRFC3339 (time: Date) {
   const minute = String(time.getUTCMinutes()).padStart(2, '0')
   const seconds = String(time.getUTCSeconds()).padStart(2, '0')
   const milliseconds = time.getUTCMilliseconds()
-  const nanoseconds = milliseconds * 1000 * 1000
+  const nanoseconds = String(milliseconds * 1000 * 1000).padStart(9, '0')
 
   return `${year}-${month}-${day}T${hour}:${minute}:${seconds}.${nanoseconds}Z`
 }

test/record.spec.ts

@@ -27,6 +27,18 @@ describe('record', () => {
     expect(dec.timeReceived).to.be.eql(date)
   })
 
+  it('serialize & deserialize with padding', () => {
+    // m/d/h/m/s/ms all need padding with 0s when converted to RFC3339 format
+    const date = new Date('2022-04-03T01:04:08.078Z')
+
+    const rec = new Libp2pRecord(uint8ArrayFromString('hello'), uint8ArrayFromString('world'), date)
+    const dec = Libp2pRecord.deserialize(rec.serialize())
+
+    expect(dec).to.have.property('key').eql(uint8ArrayFromString('hello'))
+    expect(dec).to.have.property('value').eql(uint8ArrayFromString('world'))
+    expect(dec.timeReceived).to.be.eql(date)
+  })
+
   describe('go interop', () => {
     it('no signature', () => {
       const dec = Libp2pRecord.deserialize(fixture.serialized)

test/utils.spec.ts

@@ -14,7 +14,7 @@ const dates = [{
   str: '2016-12-30T20:02:05.297000000Z'
 }, {
   obj: new Date(Date.UTC(2012, 1, 25, 10, 10, 10, 10)),
-  str: '2012-02-25T10:10:10.10000000Z'
+  str: '2012-02-25T10:10:10.010000000Z'
 }]
 
 describe('utils', () => {