linux date format
%a
Abbreviated weekday.
%b
Abbreviated month name.
%c
Country-specific date and time format.
%d
Day of month (01-31).
%h
Same as %b .
%j
Julian day of year (001-366).
%k
Hour in 24-hour format, without leading zeros (0-23).
%l
Hour in 12-hour format, without leading zeros (1-12).
%m
Month of year (01-12).
%n
Insert a new line.
%p
String to indicate a.m. or p.m.
%r
Time in %I:%M:%S %p (12-hour) format.
%s
Seconds since "the Epoch," which is 1970-01-01 00:00:00 UTC (a nonstandard extension).
%t
Insert a tab.
%w
Day of week (Sunday = 0).
%x
Country-specific date format based on locale.
%y
Last two digits of year (00-99).
%z
RFC 822-style numeric time zone.
%A
Full weekday.
%B
Full month name.
%D
Date in %m/%d/%y format.
%H
Hour in 24-hour format (00-23).
%I
Hour in 12-hour format (01-12).
%M
Minutes (00-59).
%S
Seconds (00-59).
%T
Time in %H:%M:%S format.
%U
Week number in year (00-53); start week on Sunday.
%V
Week number in year (01-52); start week on Monday.
%W
Week number in year (00-53); start week on Monday.
%X
Country-specific time format based on locale.
%Y
Four-digit year (e.g., 2006).
%Z
Time-zone name.