date command is used to display system date and time. However the default format is not very confortable to read or understand.
1. Default date format
[root@nglinux ~]# date Tue Jan 16 00:45:58 PST 2018 [root@nglinux ~]#
So we can specify the format using % sign and a format character.
Hence the best format i prefer to use in shell script is :
2. Date format to use in shell script.
[root@nglinux ~]# date +"%d-%b-%y" 14-Jan-18
We can have complete year by specifying capital Y.
3. Date with complete year.
[root@nglinux ~]# date +"%d-%b-%Y" 14-Jan-2018 [root@nglinux ~]#
If you want to specify time, then we can add %T in the format tab.
4. Add time in Date format.
[root@nglinux ~]# date +"%d-%b-%Y %T" 16-Jan-2018 00:48:57 [root@nglinux ~]#
So we can conclude the syntax of date command as follows:
To see all formats supported by date command, we can see the help or man page.
%% a literal % %a locale's abbreviated weekday name (e.g., Sun) %A locale's full weekday name (e.g., Sunday) %b locale's abbreviated month name (e.g., Jan) %B locale's full month name (e.g., January) %c locale's date and time (e.g., Thu Mar 3 23:05:25 2005) %C century; like %Y, except omit last two digits (e.g., 20) %d day of month (e.g, 01) %D date; same as %m/%d/%y %e day of month, space padded; same as %_d %F full date; same as %Y-%m-%d %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 %h same as %b %H hour (00..23) %I hour (01..12) %j day of year (001..366) %k hour ( 0..23) %l hour ( 1..12) %m month (01..12) %M minute (00..59) %n a newline %N nanoseconds (000000000..999999999) %p locale's equivalent of either AM or PM; blank if not known %P like %p, but lower case %r locale's 12-hour clock time (e.g., 11:11:04 PM) %R 24-hour hour and minute; same as %H:%M %s seconds since 1970-01-01 00:00:00 UTC %S second (00..60) %t a tab %T time; same as %H:%M:%S %u day of week (1..7); 1 is Monday %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 day of week (0..6); 0 is Sunday %W week number of year, with Monday as first day of week (00..53) %x locale's date representation (e.g., 12/31/99) %X locale's time representation (e.g., 23:13:48) %y last two digits of year (00..99) %Y year %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)
You can modify the format as per the above % characters.
I hope you liked the article.
Please do comment your suggestions/questions below.