Date ISO format pattern

Here is the complete list of available replacements:

(Examples given with 2017-01-05 17:04:05.084512)

Code Example Description
OD 5 Day number with alternative numbers such as 三 for 3 if locale is ja_JP
OM 1 Month number with alternative numbers such as ၀၂ for 2 if locale is my_MM
OY 2017 Year number with alternative numbers such as ۱۹۹۸ for 1998 if locale is fa
OH 17 24-hours number with alternative numbers such as ႑႓ for 13 if locale is shn_MM
Oh 5 12-hours number with alternative numbers such as 十一 for 11 if locale is lzh_TW
Om 4 Minute number with alternative numbers such as ୫୭ for 57 if locale is or
Os 5 Second number with alternative numbers such as 十五 for 15 if locale is ja_JP
D 5 Day of month number (from 1 to 31)
DD 05 Day of month number with trailing zero (from 01 to 31)
Do 5th Day of month with ordinal suffix (from 1st to 31th), translatable
d 4 Day of week number (from 0 (Sunday) to 6 (Saturday))
dd Th Minified day name (from Su to Sa), transatable
ddd Thu Short day name (from Sun to Sat), transatable
dddd Thursday Day name (from Sunday to Saturday), transatable
DDD 5 Day of year number (from 1 to 366)
DDDD 005 Day of year number with trailing zeros (3 digits, from 001 to 366)
DDDo 5th Day of year number with ordinal suffix (from 1st to 366th), translatable
e 4 Day of week number (from 0 (Sunday) to 6 (Saturday)), similar to “d” but this one is translatable (takes first day of week of the current locale)
E 4 Day of week number (from 1 (Monday) to 7 (Sunday))
H 17 Hour from 0 to 23
HH 17 Hour with trailing zero from 00 to 23
h 5 Hour from 0 to 12
hh 05 Hour with trailing zero from 00 to 12
k 17 Hour from 1 to 24
kk 17 Hour with trailing zero from 01 to 24
m 4 Minute from 0 to 59
mm 04 Minute with trailing zero from 00 to 59
a pm Meridiem am/pm
A PM Meridiem AM/PM
s 5 Second from 0 to 59
ss 05 Second with trailing zero from 00 to 59
S 0 Second tenth
SS 08 Second hundredth (on 2 digits with trailing zero)
SSS 084 Millisecond (on 3 digits with trailing zeros)
SSSS 0845 Second ten thousandth (on 4 digits with trailing zeros)
SSSSS 08451 Second hundred thousandth (on 5 digits with trailing zeros)
SSSSSS 084512 Microsecond (on 6 digits with trailing zeros)
SSSSSSS 0845120 Second ten millionth (on 7 digits with trailing zeros)
SSSSSSSS 08451200 Second hundred millionth (on 8 digits with trailing zeros)
SSSSSSSSS 084512000 Nanosecond (on 9 digits with trailing zeros)
M 1 Month from 1 to 12
MM 01 Month with trailing zero from 01 to 12
MMM Jan Short month name, translatable
MMMM January Month name, translatable
Mo 1st Month with ordinal suffix from 1st to 12th, translatable
Q 1 Quarter from 1 to 4
Qo 1st Quarter with ordinal suffix from 1st to 4th, translatable
G 2017 ISO week year (see ISO week date)
GG 2017 ISO week year (on 2 digits with trailing zero)
GGG 2017 ISO week year (on 3 digits with trailing zeros)
GGGG 2017 ISO week year (on 4 digits with trailing zeros)
GGGGG 02017 ISO week year (on 5 digits with trailing zeros)
g 2017 Week year according to locale settings, translatable
gg 2017 Week year according to locale settings (on 2 digits with trailing zero), translatable
ggg 2017 Week year according to locale settings (on 3 digits with trailing zeros), translatable
gggg 2017 Week year according to locale settings (on 4 digits with trailing zeros), translatable
ggggg 02017 Week year according to locale settings (on 5 digits with trailing zeros), translatable
W 1 ISO week number in the year (see ISO week date)
WW 01 ISO week number in the year (on 2 digits with trailing zero)
Wo 1st ISO week number in the year with ordinal suffix, translatable
w 1 Week number in the year according to locale settings, translatable
ww 01 Week number in the year according to locale settings (on 2 digits with trailing zero)
wo 1st Week number in the year according to locale settings with ordinal suffix, translatable
x 1483635845085 Millisecond-precision timestamp (same as date.getTime() in JavaScript)
X 1483635845 Timestamp (number of seconds since 1970-01-01)
Y 2017 Full year from -9999 to 9999
YY 17 Year on 2 digits from 00 to 99
YYYY 2017 Year on 4 digits from 0000 to 9999
YYYYY 02017 Year on 5 digits from 00000 to 09999
YYYYYY +002017 Year on 5 digits with sign from -09999 to +09999
z UTC Abbreviated time zone name
zz UTC Time zone name
Z +00:00 Time zone offset HH:mm
ZZ +0000 Time zone offset HHmm

Some macro-formats are also available. Here are examples of each in some languages:

Code en fr ja hr
LT h:mm A
5:04 PM
HH:mm
17:04
HH:mm
17:04
H:mm
17:04
LTS h:mm:ss A
5:04:05 PM
HH:mm:ss
17:04:05
HH:mm:ss
17:04:05
H:mm:ss
17:04:05
L

l

MM/DD/YYYY
01/05/20171/5/2017
DD/MM/YYYY
05/01/20175/1/2017
YYYY/MM/DD
2017/01/052017/1/5
DD.MM.YYYY
05.01.20175.1.2017
LL

ll

MMMM D, YYYY
January 5, 2017Jan 5, 2017
D MMMM YYYY
5 janvier 20175 janv. 2017
YYYY年M月D日
2017年1月5日2017年1月5日
D. MMMM YYYY
5. siječnja 20175. sij. 2017
LLL

lll

MMMM D, YYYY h:mm A
January 5, 2017 5:04 PMJan 5, 2017 5:04 PM
D MMMM YYYY HH:mm
5 janvier 2017 17:045 janv. 2017 17:04
YYYY年M月D日 HH:mm
2017年1月5日 17:042017年1月5日 17:04
D. MMMM YYYY H:mm
5. siječnja 2017 17:045. sij. 2017 17:04
LLLL

llll

dddd, MMMM D, YYYY h:mm A
Thursday, January 5, 2017 5:04 PMThu, Jan 5, 2017 5:04 PM
dddd D MMMM YYYY HH:mm
jeudi 5 janvier 2017 17:04jeu. 5 janv. 2017 17:04
YYYY年M月D日 dddd HH:mm
2017年1月5日 木曜日 17:042017年1月5日 木 17:04
dddd, D. MMMM YYYY H:mm
četvrtak, 5. siječnja 2017 17:04čet., 5. sij. 2017 17:04

Characters and words can be escaped with [word]. Example: YYYY [escaped] YYYY => 2017 escaped 2017

Source: carbon.nesbot.com