Add Timestamp

Author: op

src/timestamp.js

@@ -0,0 +1,19 @@
+'use strict';
+
+function Timestamp(seconds, nanoseconds) {
+  this.seconds = seconds;
+  this.nanoseconds = nanoseconds;
+}
+
+Timestamp.fromDate = function(date) {
+  var sec = Math.floor(date.getTime() / 1000);
+  var ns = (date.getTime() % 1000) * 1000 * 1000;
+  return new Timestamp(sec, ns);
+};
+
+Timestamp.prototype.toDate = function () {
+  var millis = this.seconds * 1000 + this.nanoseconds / (1000 * 1000);
+  return new Date(millis);
+};
+
+module.exports = Timestamp;

test/unit/timestamp.js

@@ -0,0 +1,23 @@
+'use strict';
+
+var expect   = require('chai').use(require('sinon-chai')).expect;
+var sinon    = require('sinon');
+var Timestamp = require('../../src/timestamp');
+
+describe('Timestamp', function () {
+  describe('fromDate', function () {
+    it('should convert from date', function () {
+      var date = new Date('2009-02-13T23:31:30.123456789Z');
+      var timestamp = Timestamp.fromDate(date);
+      expect(timestamp.seconds).to.equal(1234567890);
+      expect(timestamp.nanoseconds).to.equal(123000000);
+    });
+  });
+  describe('#toDate', function () {
+    it('should convert to date', function () {
+      var ts = new Timestamp(1234567890, 123456789);
+      var date = ts.toDate();
+      expect(date.toISOString()).to.equal('2009-02-13T23:31:30.123Z');
+    });
+  });
+});