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date [2013/01/27 21:29] (current)
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 +====== date ======
 +
 +Usage: date [OPTION]... [+FORMAT]<​br /> or: date [-u|--utc|--universal] [MMDDhhmm[[CC]YY|.ss]]<​br />​Display the current time in the given FORMAT, or set the system date.<br /><br /> -d, --date''​STRING ​       display time described by STRING, not `now'<​br /> -f, --file''​DATEFILE ​     like --date once for each line of DATEFILE<​br /> -r, --reference''​FILE ​    ​display the last modification time of FILE<br /> -R, --rfc-2822 ​          ​output date and time in RFC 2822 format.<​br />                           ​Example:​ Mon, 07 Aug 2006 12:34:56 -0600<br />     ​--rfc-3339''​TIMESPEC ​ output date and time in RFC 3339 format.<​br />                           ​TIMESPEC''​`date',​ `seconds',​ or `ns' for<br />                           date and time to the indicated precision.<​br />                           Date and time components are separated by<br />                           a single space: 2006-08-07 12:​34:​56-06:​00<​br /> -s, --set''​STRING ​        set time described by STRING<​br /> -u, --utc, --universal ​  print or set Coordinated Universal Time<br />     ​--help ​   display this help and exit<br />     ​--version output version information and exit<br /><br />FORMAT controls the output. The only valid option for the second form<br />​specifies Coordinated Universal Time. Interpreted sequences are:<br /><br /> %%  a literal %<br /> %a  locale'​s abbreviated weekday name (e.g., Sun)<br /> %A  locale'​s full weekday name (e.g., Sunday)<​br /> %b  locale'​s abbreviated month name (e.g., Jan)<br /> %B  locale'​s full month name (e.g., January)<​br /> %c  locale'​s date and time (e.g., Thu Mar 3 23:05:25 2005)<br /> %C  century; like %Y, except omit last two digits (e.g., 21)<br /> %d  day of month (e.g, 01)<br /> %D  date; same as %m/​%d/​%y<​br /> %e  day of month, space padded; same as %_d<br /> %F  full date; same as %Y-%m-%d<​br /> %g  last two digits of year of ISO week number (see %G)<br /> %G  year of ISO week number (see %V); normally useful only with %V<br /> %h  same as %b<br /> %H  hour (00..23)<​br /> %I  hour (01..12)<​br /> %j  day of year (001..366)<​br /> %k  hour ( 0..23)<​br /> %l  hour ( 1..12)<​br /> %m  month (01..12)<​br /> %M  minute (00..59)<​br /> %n  a newline<​br /> %N  nanoseconds (000000000..999999999)<​br /> %p  locale'​s equivalent of either AM or PM; blank if not known<br /> %P  like %p, but lower case<br /> %r  locale'​s 12-hour clock time (e.g., 11:11:04 PM)<br /> %R  24-hour hour and minute; same as %H:%M<br /> %s  seconds since 1970-01-01 00:00:00 UTC<br /> %S  second (00..60)<​br /> %t  a tab<br /> %T  time; same as %H:​%M:​%S<​br /> %u  day of week (1..7); 1 is Monday<​br /> %U  week number of year, with Sunday as first day of week (00..53)<​br /> %V  ISO week number, with Monday as first day of week (01..53)<​br /> %w  day of week (0..6); 0 is Sunday<​br /> %W  week number of year, with Monday as first day of week (00..53)<​br /> %x  locale'​s date representation (e.g., 12/​31/​99)<​br /> %X  locale'​s time representation (e.g., 23:​13:​48)<​br /> %y  last two digits of year (00..99)<​br /> %Y  year<br /> %z  +hhmm numeric timezone (e.g., -0400)<​br /> %:z +hh:mm numeric timezone (e.g., -04:​00)<​br /> %::z +hh:mm:ss numeric time zone (e.g., -04:​00:​00)<​br /> %:::z numeric time zone with : to necessary precision (e.g., -04, +05:​30)<​br /> %Z  alphabetic time zone abbreviation (e.g., EDT)<br /><br />By default, date pads numeric fields with zeroes.<​br />The following optional flags may follow `%':<​br /><br /> - (hyphen) do not pad the field<br /> //​(underscore) pad with spaces<​br /> 0 (zero) pad with zeros<br /> ^ use upper case if possible<​br /> # use opposite case if possible<​br /><br />After any flags comes an optional field width, as a decimal number;<​br />then an optional modifier, which is either<​br />E to use the locale'​s alternate representations if available, or<br />O to use the locale'​s alternate numeric symbols if available.<​br /><br />Report bugs to &​lt;​bug-coreutils@gnu.org&​gt;​.
 +
 +===== How To Get Yesterday'​s Date using BASH Shell =====
 +
 +The new short way:
 +<​file>​
 +$ date -d '1 day ago' +'​%Y/​%m/​%d'​
 +2012/05/18
 +</​file>​
 +
 +Or the longer way: Yesterday in epoch seconds
 +<​file>​
 +$ yesterday''​$((`date +'​%s'​` - 86400))
 +</​file>​
 +
 +Get default formatted yesterday'​s date
 +<​file>​
 +$ date -d "​1970-01-01 $yesterday sec"
 +Thu May 18 01:27:32 MST 2012
 +</​file>​
 +
 +Same thing in YY-MM-DD
 +<​file>​
 +$ date -d "​1970-01-01 $yesterday sec" +"​%Y-%m-%d"​
 +2012-05-18
 +</​file>​
 +
 +-- Main.FredPettis - 2012-05-19
  
date.txt ยท Last modified: 2013/01/27 21:29 (external edit)