Dates & Times Are Tricky

• Complicated Timezones
• Daylight Savings
• Date Format
  day/month/year, month/day/year, year-month-day
• Leap Seconds
• Differing Calendars

JavaScript Date Object

• Represents a single moment in time
• Based on number of milliseconds since midnight 1st January 1970 UTC
• Standard built-in object

Creating a Date Object

/* 
Create a JavaScript Date object 
for the current date and time
*/
var today = new Date(); 

/*
Different ways to create a Date object
representing 03:24 on November 17th, 1995
*/

// Parsing from an ISO-8601 format String
var isoParseDate = new Date('1995-11-17T03:24:00');

// Integer parameters for year, month, date, hours, minutes, seconds
var intParamDate = new Date(1995, 11, 17, 3, 24, 0);

JavaScript Date Methods

• Methods for manipulating date according to local
  time and according to universal time (UTC) 
• getDate, getUTCDate, setDate, setUTCDate,
  getMonth, getUTCMonth, setMonth, setUTCMonth, etc.

Full List At:

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date#Date.prototype_Methods

getYear and setYear

• Deprecated Methods
• Only work for years between 1900 and 1999
• Designed for two digit year representation

Year 2000 Problem

The JavaScript Solution

• Use getFullYear/getUTCFullYear & setFullYear/setUTCFullYear Instead
• Works For Years Between 1000 and 9999

A Quick Demo

http://codepen.io/jstafford-rte/pen/LVgRzd/