javascript 日期格式化（转）

原文及附件：http://blog.stevenlevithan.com/archives/date-time-format

Mask	Description
d	Day of the month as digits; no leading zero for single-digit days.
dd	Day of the month as digits; leading zero for single-digit days.
ddd	Day of the week as a three-letter abbreviation.
dddd	Day of the week as its full name.
m	Month as digits; no leading zero for single-digit months.
mm	Month as digits; leading zero for single-digit months.
mmm	Month as a three-letter abbreviation.
mmmm	Month as its full name.
yy	Year as last two digits; leading zero for years less than 10.
yyyy	Year represented by four digits.
h	Hours; no leading zero for single-digit hours (12-hour clock).
hh	Hours; leading zero for single-digit hours (12-hour clock).
H	Hours; no leading zero for single-digit hours (24-hour clock).
HH	Hours; leading zero for single-digit hours (24-hour clock).
M	Minutes; no leading zero for single-digit minutes. Uppercase M unlike CF timeFormat's m to avoid conflict with months.
MM	Minutes; leading zero for single-digit minutes. Uppercase MM unlike CF timeFormat's mm to avoid conflict with months.
s	Seconds; no leading zero for single-digit seconds.
ss	Seconds; leading zero for single-digit seconds.
l or L	Milliseconds. l gives 3 digits. L gives 2 digits.
t	Lowercase, single-character time marker string: a or p. No equivalent in CF.
tt	Lowercase, two-character time marker string: am or pm. No equivalent in CF.
T	Uppercase, single-character time marker string: A or P. Uppercase T unlike CF's t to allow for user-specified casing.
TT	Uppercase, two-character time marker string: AM or PM. Uppercase TT unlike CF's tt to allow for user-specified casing.
Z	US timezone abbreviation, e.g. EST or MDT. With non-US timezones or in the Opera browser, the GMT/UTC offset is returned, e.g. GMT-0500 No equivalent in CF.
o	GMT/UTC timezone offset, e.g. -0500 or +0230. No equivalent in CF.
S	The date's ordinal suffix (st, nd, rd, or th). Works well with d. No equivalent in CF.
'…'or"…"	Literal character sequence. Surrounding quotes are removed. No equivalent in CF.
UTC:	Must be the first four characters of the mask. Converts the date from local time to UTC/GMT/Zulu time before applying the mask. The "UTC:" prefix is removed. No equivalent in CF.

And here are the named masks provided by default (you can easily change these or add your own):

Name	Mask	Example
default	ddd mmm dd yyyy HH:MM:ss	Sat Jun 09 2007 17:46:21
shortDate	m/d/yy	6/9/07
mediumDate	mmm d, yyyy	Jun 9, 2007
longDate	mmmm d, yyyy	June 9, 2007
fullDate	dddd, mmmm d, yyyy	Saturday, June 9, 2007
shortTime	h:MM TT	5:46 PM
mediumTime	h:MM:ss TT	5:46:21 PM
longTime	h:MM:ss TT Z	5:46:21 PM EST
isoDate	yyyy-mm-dd	2007-06-09
isoTime	HH:MM:ss	17:46:21
isoDateTime	yyyy-mm-dd'T'HH:MM:ss	2007-06-09T17:46:21
isoUtcDateTime	UTC:yyyy-mm-dd'T'HH:MM:ss'Z'	2007-06-09T22:46:21Z