Date.parse(string)

Similar to passing a string to new Date() constructor, this method parses the input string in an attempt to extract a valid date value. Returns a timestamp on success, NaN on failure:

> Date.parse('May 5, 2015');
1430809200000
> Date.parse('4th');
NaN

Date.UTC(year, month, date, hours, minutes, seconds, ms)

Returns a timestamp but in UTC (Coordinated Universal Time), not in local time.

> Date.UTC(2015, 0, 1, 13, 30, 35, 505);
1420119035505

toUTCString()

Same as toString() but in universal time. Here's how Pacific Standard (PST) local time differs from UTC:

> var d = new Date(2015, 0, 1);
> d.toString();
"Thu Jan 01 2015 00:00:00 GMT-0800 (PST)"
> d.toUTCString();
"Thu, 01 Jan 2015 08:00:00 GMT"

toDateString()

Returns only the date portion of toString():

> new Date(2015, 0, 1).toDateString();
"Thu Jan 01 2010"

toTimeString()

Returns only the time portion of toString():

> new Date(2015, 0, 1).toTimeString();
"00:00:00 GMT-0800 (PST)"

toLocaleString()

toLocaleDateString()

toLocaleTimeString()

Equivalent to toString(), toDateString(), and toTimeString() respectively, but in a friendlier format, according to the current user's locale.

> new Date(2015, 0, 1).toString();
"Thu Jan 01 2015 00:00:00 GMT-0800 (PST)"
> new Date(2015, 0, 1).toLocaleString();
"1/1/2015 12:00:00 AM"

getTime()

setTime(time)

Get or set the time (using a timestamp) of a date object. The following example creates a date and moves it one day forward:

> var d = new Date(2015, 0, 1);
> d.getTime();
1420099200000
> d.setTime(d.getTime()+ 1000 * 60 * 60 * 24);
1420185600000
> d.toLocaleString();
"Fri Jan 02 2015 00:00:00 GMT-0800 (PST)"

getFullYear()

getUTCFullYear()

setFullYear(year, month, date)

setUTCFullYear(year, month, da te)

Get or set a full year using local or UTC time. There is also getYear() but it is not Y2K compliant, so use getFullYear() instead.

> var d = new Date(2015, 0, 1);
> d.getYear();
115
> d.getFullYear();
2015
> d.setFullYear(2020);
1577865600000
> d;
Wed Jan 01 2020 00:00:00 GMT-0800 (PST)

getMonth()

getUTCMonth()

setMonth(month, date)

setUTCMonth(month, date)

Get or set the month, starting from 0 (January):

> var d = new Date(2015, 0, 1);
> d.getMonth();
0
> d.setMonth(11);
1448956800000
> d.toLocaleDateString();
"12/1/2015"

getDate()

getUTCDate()

setDate(date)

setUTCDate(date)

Get or set the date of the month.

> var d = new Date(2015, 0, 1);
> d.toLocaleDateString();
"1/1/2015"
> d.getDate();
1
> d.setDate(31);
1422691200000
> d.toLocaleDateString();
"1/31/2015"

getHours()

getUTCHours()

setHours(hour, min, sec, ms)

setUTCHours(hour, min, sec, ms)

getMinutes()

getUTCMinutes()

setMinutes(min, sec, ms)

setUTCMinutes(min, sec, ms)

getSeconds()

getUTCSeconds()

setSeconds(sec, ms)

setUTCSeconds(sec, ms)

getMilliseconds()

getUTCMilliseconds()

setMilliseconds(ms)

setUTCMilliseconds(ms )

Get or set the hour, minutes, seconds, milliseconds, all starting from 0.

> var d = new Date(2015, 0, 1);
> d.getHours() + ':' + d.getMinutes();
"0:0"
> d.setMinutes(59);
1420102740000
> d.getHours() + ':' + d.getMinutes();
"0:59"

getTimezoneOffset()

Returns the difference between local and universal (UTC) time, measured in minutes. For example, the difference between PST (Pacific Standard Time) and UTC:

> new Date().getTimezoneOffset();
480
> 420 / 60; // hours
8

getDay()

getUTCDay( )

Returns the day of the week, starting from 0 (Sunday):

> var d = new Date(2015, 0, 1); 
> d.toDateString();
"Thu Jan 01 2015"
> d.getDay();
4
> var d = new Date(2015, 0, 4); 
> d.toDateString();
"Sat Jan 04 2015"
> d.getDay();
0

Date.now()

A convenient way to get the current timestamp:

> Date.now() === new Date().getTime();
true

Date.prototype.toISOString()

Yet another toString().

> var d = new Date(2015, 0, 1);
> d.toString();
"Thu Jan 01 2015 00:00:00 GMT-0800 (PST)"
> d.toUTCString();
"Thu, 01 Jan 2015 08:00:00 GMT"
> d.toISOString();
"2015-01-01T00:00:00.000Z"

Date.prototype.toJSON()

Used by JSON.stringify() (refer to the end of this appendix) and returns the same as toISOString().

> var d = new Date();
> d.toJSON() === d.toISOString();
true