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$ date "+%Y"
To date-stamp or time-stamp your files, the following may be useful within scripts:
date +%F # yyyy-mm-dd, e.g 2016-02-10
date +%H-%M-%S # hh-mm-ss, e.g. 15-26-10
date +%F-%H-%M-%S # Combines the two above.
date +%s # Unix timestamp, e.g. 1455089288
date +%s.%N # If necessary, add nanoseconds, e.g. 1455089359.711595818.
The man page has the format codes listed in alphabetical order. Here is a more convenient ordering by time frame:
%c locale's date and time (e.g., Thu Mar 3 23:05:25 2005) %D date; same as %m/%d/%y %F full date; same as %Y-%m-%d %r locale's 12-hour clock time (e.g., 11:11:04 PM) %R 24-hour hour and minute; same as %H:%M %T time; same as %H:%M:%S %x locale's date representation (e.g., 12/31/99) %X locale's time representation (e.g., 23:13:48)
%C century; like %Y, except omit last two digits (e.g., 20) %g last two digits of year of ISO week number (see %G) %G year of ISO week number (see %V); normally useful only with %V %y last two digits of year (00..99) %Y year, four digits (e.g. 2016)
%b locale's abbreviated month name (e.g., Jan) %h same as %b %B locale's full month name (e.g., January) %m month (01..12)
%g last two digits of year of ISO week number (see %G) %G year of ISO week number (see %V); normally useful only with %V %U week number of year, with Sunday as first day of week (00..53) %V ISO week number, with Monday as first day of week (01..53) %W week number of year, with Monday as first day of week (00..53)
For week days, see below.
day of the year, month, week
Day of the year:
%j day of year (001..366)
Day of the month:
%d day of month (e.g, 01) %e day of month, space padded; same as %_d
Day of the week:
%a locale's abbreviated weekday name (e.g., Sun) %A locale's full weekday name (e.g., Sunday) %u day of week (1..7); 1 is Monday %w day of week (0..6); 0 is Sunday
%H hour (00..23) %I hour (01..12) %k hour ( 0..23) %l hour ( 1..12) %p locale's equivalent of either AM or PM; blank if not known %P like %p, but lower case
%M minute (00..59)
seconds, nanoseconds, timestamp
%S second (00..60) %s seconds since 1970-01-01 00:00:00 UTC %N nanoseconds (000000000..999999999)
%z +hhmm numeric timezone (e.g., -0400) %:z +hh:mm numeric timezone (e.g., -04:00) %::z +hh:mm:ss numeric time zone (e.g., -04:00:00) %:::z numeric time zone with : to necessary precision (e.g., -04, +05:30) %Z alphabetic time zone abbreviation (e.g., EDT)
%% a literal % %n a newline %t a tab
By default, date pads numeric fields with zeroes. The following optional flags may follow `%':
- (hyphen) do not pad the field _ (underscore) pad with spaces 0 (zero) pad with zeros ^ use upper case if possible # use opposite case if possible
$ date "%Y"
date: invalid date `%Y'
Do not forget the + sign:
$ date 1467237996
date: invalid date `1467237996'
$ date -d @1467237996
Thu Jun 30 06:06:36 CST 2016
This use of date is only documented in the 'examples' section of the man page for date.
$ date now "+%Y"
date: extra operand `+%Y'
Try `date --help' for more information.
datedisplays the current date.