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Date & Time

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cmd:date

Usage

$ date -I
2005-08-04

$ date -Iseconds
2005-08-04T17:24:39-0400

$ date -Iseconds -u
2007-06-21T13:10:18+0000

$ date '+%H:%M:%S'
17:24:41

$ date '+%Y%m%d'
20020321

$ date '+%y%m%d'
020321

Advanced Usages

# tomorrow
date --date=tomorrow

# yesterday
date --date='-1 day'

# last month
date --date='-1 month'

# next month
date --date='+1 month' '+%m %Y'

Set

$ printf 'Set current time: date '; date '+%m%d%H%M'
Set current time: date 03281506

$ printf 'Set current time: date '; date '+%m%d%H%M%y'
Set current time: date 0101184403

% date 03181019
Mon Mar 18 10:19:00 CST 2002

$  date
Mon Mar 18 10:19:03 CST 2002

DESCRIPTION

Display the current time in the given FORMAT, or set the system date.

%Y     year (1970...)
%y     last two digits of year (00..99)
%m     month (01..12)
%d     day of month (01..31)
%H     hour (00..23)
%I     hour (01..12)
%M     minute (00..59)
%S     second (00..60); the 60 is for a leap  second

day of week

Every system should have gnu date:

$ date -d "Sun Jul 25 09:10:27 PDT 1999" '+%w %a %A'
0 Sun Sunday

Dan Mercer