mamentjs format -- Обозначения в строке формата (буквы и их значения)

Если объединить:

YYYY 	2014 	4 or 2 digit year
YY 	14 	2 digit year
Y 	-25 	Year with any number of digits and sign
Q 	1..4 	Quarter of year. Sets month to first month in quarter.
M MM 	1..12 	Month number
MMM MMMM 	Jan..December 	Month name in locale set by moment.locale()
D DD 	1..31 	Day of month
Do 	1st..31st 	Day of month with ordinal
DDD DDDD 	1..365 	Day of year
X 	1410715640.579 	Unix timestamp
x 	1410715640579 	Unix ms timestamp

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For these, the lowercase tokens use the locale aware week start days, and the uppercase tokens use the ISO week date start days.
Input 	Example 	Description
gggg 	2014 	Locale 4 digit week year
gg 	14 	Locale 2 digit week year
w ww 	1..53 	Locale week of year
e 	0..6 	Locale day of week
ddd dddd 	Mon...Sunday 	Day name in locale set by moment.locale()
GGGG 	2014 	ISO 4 digit week year
GG 	14 	ISO 2 digit week year
W WW 	1..53 	ISO week of year
E 	1..7 	ISO day of week

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Часы минуты секунды и временное смещение:
Input 	Example 	Description
H HH 	0..23 	Hours (24 hour time)
h hh 	1..12 	Hours (12 hour time used with a A.)
k kk 	1..24 	Hours (24 hour time from 1 to 24)
a A 	am pm 	Post or ante meridiem (Note the one character a p are also considered valid)
m mm 	0..59 	Minutes
s ss 	0..59 	Seconds
S SS SSS 	0..999 	Fractional seconds
Z ZZ 	+12:00 	(timezone) Offset from UTC as +-HH:mm, +-HHmm, or Z 

Подробности: https://momentjs.com/docs/#/parsing/stri...