date

date ��� Format a local time/date

Description

(date format timestamp)

Returns a string formatted according to the given format string using the given integer timestamp or the current time if no timestamp is given. In other words, timestamp is optional and defaults to the value of
(get-universal-time).

Parameters

format character	Description	Example returned values
Day	---	---
d	Day of the month, 2 digits with leading zeros	01 to 31
D	A textual representation of a day, three letters	Mon through Sun
j	Day of the month without leading zeros	1 to 31
l (lowercase 'L')	A full textual representation of the day of the week	Sunday through Saturday
N	ISO-8601 numeric representation of the day of the week	1 (for Monday) through 7 (for Sunday)
S	English ordinal suffix for the day of the month, 2 characters	st, nd, rd or th. Works well with j
w	Numeric representation of the day of the week	0 (for Sunday) through 6 (for Saturday)
z	The day of the year (starting from 0)	0 through 365
Week	---	---
W	ISO-8601 week number of year, weeks starting on Monday	Example: 42 (the 42nd week in the year)
Month	---	---
F	A full textual representation of a month, such as January or March	January through December
m	Numeric representation of a month, with leading zeros	01 through 12
M	A short textual representation of a month, three letters	Jan through Dec
n	Numeric representation of a month, without leading zeros	1 through 12
t	Number of days in the given month	28 through 31
Year	---	---
L	Whether it's a leap year	1 if it is a leap year, 0 otherwise.
o	ISO-8601 year number. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead.	Examples: 1999 or 2003
Y	A full numeric representation of a year, 4 digits	Examples: 1999 or 2003
y	A two digit representation of a year	Examples: 99 or 03
Time	---	---
a	Lowercase Ante meridiem and Post meridiem	am or pm
A	Uppercase Ante meridiem and Post meridiem	AM or PM
B	Swatch Internet time	000 through 999
g	12-hour format of an hour without leading zeros	1 through 12
G	24-hour format of an hour without leading zeros	0 through 23
h	12-hour format of an hour with leading zeros	01 through 12
H	24-hour format of an hour with leading zeros	00 through 23
i	Minutes with leading zeros	00 to 59
s	Seconds, with leading zeros	00 through 59
q	milliseconds to three digits with leading zeroes	000 through 999
Timezone	---	---
e	Timezone identifier	Examples: UTC, GMT, Atlantic/Azores
I (capital i)	Whether or not the date is in daylight saving time	1 if Daylight Saving Time, 0 otherwise.
O	Difference to Greenwich time (GMT) in hours	Example: +0200
P	Difference to Greenwich time (GMT) with colon between hours and minutes	Example: +02:00
T	Timezone abbreviation	Examples: EST, MDT ...
Z	Timezone offset in seconds. The offset for timezones west of UTC is always negative, and for those east of UTC is always positive.	-43200 through 50400
Full Date/Time	---	---
c	ISO 8601 date	2004-02-12T15:19:21+00:00
r	» RFC 2822 formatted date	Example: Thu, 21 Dec 2000 16:01:07 +0200
U	Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)

Examples

date examples

	;; Prints something like: Monday
	(date "l");

	;; Prints something like: Monday 15th of August 2005 03:12:46 PM
	(date "l dS \\of F Y h:i:s A")
	
	// Prints: July 1, 2000 is on a Sunday
	(format t "July 1, 2000 is on a ~A"  (date "l", (encode-universal-time 0, 0, 0, 7, 1, 2000)))
	
	;; use the constants in the format parameter 
	;;prints something like: Mon, 15 Aug 2005 15:12:46 UTC
	(date DATE-RFC822)
	
	;; prints something like: 2000-07-01T00:00:00+00:00
	(date DATE-ATOM, (encode-universal-time 0, 0, 0, 7, 1, 2000));
      

You can prevent a recognized character in the format string from being expanded by escaping it with a preceding backslash. If the character with a backslash is already a special sequence, you may need to also escape the backslash.

Example Escaping characters in (date)

	;; prints something like: Wednesday the 15th
	(write-line date("l \\t\h\e jS"))
      

Some examples of (date) formatting. Note that you should escape any other characters, as any which currently have a special meaning will produce undesirable results, and other characters may be assigned meaning in future versions.

date formatting

	;;Assuming today is: March 10th, 2001, 5:16:18 pm
	
	(date "F j, Y, g:i a") 
	-- "March 10, 2001, 5:16 pm"
	(date "m.d.y") 
	-- "03.10.01"
	(date "j, n, Y") 
	-- "10, 3, 2001"
	(date "Ymd") 
	-- "20010310"
	(date 'h-i-s, j-m-y, it is w Day z ') 
	-- "05-16-17, 10-03-01, 1631 1618 6 Fripm01"
	(date '\\i\\t \\i\\s \\t\\h\\e jS \\d\\a\\y.') 
	-- "It is the 10th day."
	(date "D M j G:i:s T Y") 
	-- "Sat Mar 10 15:16:08 MST 2001"
	(date 'H:m:s \\m \\i\\s\\ \\m\\o\\n\\t\\h') 
	-- "17:03:17 m is month"
	(date "H:i:s")
	-- "17:16:17"