feat(gql): add date support to gql

Closes #719

app/scripts/components/gql/module.ts

@@ -358,9 +358,11 @@ module ngApp.components.gql {
             $scope.ddItems = _.filter(
                 GqlService.parseGrammarError($scope.parts.needle, $scope.error), 
                 (item: IDdItem): boolean => {
-                    var op: IDdItem = mapping[$scope.parts.op.toLowerCase()] || {}; 
-                    if ((op.type || '') === 'long' || (op.full || '').toString().indexOf('datetime') != -1) {
+                    var op: IDdItem = mapping[$scope.parts.op.toLowerCase()] || {};
+                    if (['long', 'integer'].indexOf(op.type || '') !== -1) {
                         return [T.EQ, T.NE, T.GT, T.GTE, T.LT, T.LTE, T.IS, T.NOT].indexOf(item.full.toString()) != -1
+                    } else if ((op.full || '').toString().indexOf('datetime') != -1) {
+                        return [T.GT, T.GTE, T.LT, T.LTE, T.IS, T.NOT].indexOf(item.full.toString()) != -1
                     } else if (op.type === 'string') {
                         return [T.EQ, T.NE, T.IN, T.EXCLUDE, T.IS, T.NOT].indexOf(item.full.toString()) != -1
                     } else {

gql.pegjs

@@ -100,7 +100,8 @@ ListExpr
   }
 
 Comparable
-  = INTEGER
+  = DATE
+  / INTEGER
 
 Fields
   = x:Field xs:FieldsRest* { return [x].concat(xs); }
@@ -121,6 +122,7 @@ Term "term"
   = UNQUOTED_STRING
   / QUOTED_STRING
   / INTEGER
+
 
 // Operators
 GroupOp 
@@ -142,6 +144,7 @@ CompareOp
 DIGIT "number" = [0-9]
 INTEGER = $DIGIT+
 REAL = DIGIT* "." DIGIT+
+DASH = "-"
 COMMA "," = ","
 COLON ":" = ":"
 EQUAL "=" = "="
@@ -176,7 +179,11 @@ UNQUOTED_STRING
   }
 QUOTED_STRING 
   = DBLQ s:$[^"]+ DBLQ { return s; }
-
+DATE 
+  = x:(DIGIT DIGIT DIGIT DIGIT DASH DIGIT DIGIT DASH DIGIT DIGIT)
+  {
+    return x.join('');
+  }
 // Extra
 _
   = ( WhiteSpace / NewLine )