utc-clock

A simple UTC clock, which can be used to determine the current UTC date/time in milliseconds since 1970/01/01 or formatted as ISO string.

``js
var UTCClock = require('utc-clock');
var clock = new UTCClock(/ optional: offset in milliseconds /);

console.log(clock.now.ms()); // prints the current utc timestamp in milliseconds since 1970/01/01
console.log(clock.now.iso()); // prints the current utc timestamp in ISO format
`

Consecutive calls to clock.now.ms() or clock.now.iso() will always return the current timestamp!

#### Offset
The UTCClock constructor function supports a single offset argument to specify an offset in milliseconds. Use negative numbers to set the clock the according number of milliseconds ahead.

`js
var UTCClock = require('utc-clock');
var clock = new UTCClock(-1 1000 60 60 24); // set the clock a day ahead
`

Changes the offset on an existing clock, will affect all following calls to .now.ms() and .now.iso().
`js
var UTCClock = require('utc-clock');
var clock = new UTCClock(); // no offset
console.log(clock.now.iso()); // e.g. prints 2015-12-24T00:07:00.000Z

clock.offset = -1 1000 60 60 24; // set the clock a day ahead
console.log(clock.now.iso()); // e.g. prints 2015-12-23T00:07:00.000Z

clock.offset = 0; // reset/delete offset
console.log(clock.now.iso()); // e.g. prints 2015-12-24T00:07:00.000Z again
``