Moment.js easy to manage date and time samples

You will encounter the problem of date and time in the front-end JavaScript development, often bring a lot of processing functions to complete a simple date time display effect. Today I'm going to introduce you to a lightweight JavaScript date-processing library: Moment.js, which you can use to easily address the various date-time issues encountered in front-end development.
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Moment.js does not rely on any third-party libraries, supports strings, dates, timestamps, and arrays, and can format date time, calculate relative time, get date time after a specific time, and so on, like PHP's date () function, which is illustrated in the following examples.
Format Date
Current time:

Moment (). Format (' Yyyy-mm-dd HH:mm:ss '); 2014-09-24 23:36:09
Today is the day of the week:

Moment (). Format (' d '); 3
To convert the current time UNIX timestamp:

Moment (). Format (' X ');
Relative time
20120901 Relative Current date is 2 years ago

Moment ("20120901", "YYYYMMDD"). Fromnow (); 2 years ago
7 days after Date:

Moment (). Add (' Days ', 7). Format (' YYYY year mm month DD Day '); October 01, 2014
9 hours after the time:

Moment (). Add (' hours ', 9). Format (' HH:mm:ss ');
Moment.js provides a rich description document that you can use to create complex date-time applications such as calendar items. The most common use of our daily development is formatting time, and I'll make a tabular description of the common format for friends who need it:

Format code	Description	Return value Example
M	The month that the number represents, without a leading zero	1 to 12
Mm	The month that the number represents, with a leading zero	01 to 12
MMM	A three-letter-abbreviated month	to Dec.
MMMM	month, full text format	January to December
Q	Quarter	1 to 4
D	Days of the month, no leading zeros	1 to 31
Dd	The day ordinal of the month, with a leading zero	01 to 31
D	The day ordinal of the week, the number indicates	0 to 6,0 says Sunday, 6 means Saturday
Ddd	Three letters representing the day of the week	Sun to Sat
dddd	Day of the week, full week text	From Sunday to Saturday
W	Weeks ordinal of the year	such as 42: Week 42nd
YYYY	Year with four digits full representation	such as: 2014 or 2000
Yy	Year in two-digit digits	such as: 14 or 98
A	Uppercase AM PM	AM PM
A	lowercase am pm	Am PM
HH	Hour, 24-hour system with leading zeros	00 to 23
H	Hour, 24-hour system, no leading zero	0 to 23
hh	Hour, 12-hour system with leading zeros	00 to 12
H	Hour, 12-hour system, no leading zero	0 to 12
M	Number of minutes without leading zeros	0 to 59
Mm	Number of minutes with leading zeros	00 to 59
S	Number of seconds without leading zeros	1 to 59
Ss	A description with a leading zero	01 to 59
X	Unix time stamp	1411572969