This is a string to describe date and time output format. The string is
a set of standard character and special tag that are replaced by the
corresponding values. It follows the GNU Date specification. Here are
the recognized directives :
% a literal %
n a newline
t a horizontal tab
Time fields:
%H hour (00..23)
%I hour (01..12)
%k hour ( 0..23)
%l hour ( 1..12)
%M minute (00..59)
%p locale's AM or PM
%r time, 12-hour (hh:mm:ss [AP]M)
%s seconds since 1970-01-01 00:00:00 UTC
(a nonstandard extension)
%S second (00..59)
%T time, 24-hour (hh:mm:ss)
Date fields:
%a locale's abbreviated weekday name (Sun..Sat)
%A locale's full weekday name, variable length
(Sunday..Saturday)
%b locale's abbreviated month name (Jan..Dec)
%B locale's full month name, variable length
(January..December)
%c locale's date and time (Sat Nov 04 12:02:33 EST 1989)
%d day of month (01..31)
%D date (mm/dd/yy)
%h same as %b
%j day of year (001..366)
%m month (01..12)
%U week number of year with Sunday as first day of week
(00..53)
%w day of week (0..6) with 0 corresponding to Sunday
%W week number of year with Monday as first day of week
(00..53)
%x locale's date representation (mm/dd/yy)
%y last two digits of year (00..99)
%Y year (1970...)
By default, date pads numeric fields with zeroes. GNU date
recognizes the following nonstandard numeric modifiers:
- (hyphen) do not pad the field
_ (underscore) pad the field with spaces