Thursday, November 11, 2010

Linux shell commands for date and time



To display and set the date and time the below format 


date [OPTION]... [+FORMAT]

Example: To display the date alone with year,month and day


$ date "+%Y/%m/%d"
Response: 2010/11/11 (Current date)

2 comments:

  1. Below are the format which can be used depending upon the application need

    FORMAT controls the output. Interpreted sequences are:

    %% a literal %
    %a localeâs abbreviated weekday name (e.g., Sun)
    %A localeâs full weekday name (e.g., Sunday)
    %b localeâs abbreviated month name (e.g., Jan)
    %B localeâs full month name (e.g., January)
    %c localeâs 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 localeâs equivalent of either AM or PM; blank if not known
    %P like %p, but lower case
    %r localeâs 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 localeâs date representation (e.g., 12/31/99)
    %X localeâs 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)

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  2. For example if you want to know the number of days passed in the current year we need to execute

    $ date +%j
    315

    You can also execute with the double quote
    $ date "+%j"
    315

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