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Top Forums Shell Programming and Scripting Help needed-calculate previous date Post 302229645 by sureshg_sampat on Wednesday 27th of August 2008 12:20:02 PM
Old 08-27-2008
Help needed-calculate previous date

Hi Friends,

Need a command/script in unix which calculates previous date [day -1] from current date.

For ex:
If current date= 01 Jan 2008, then output =31 Dec 2007
If current_date =01 Aug 2008 , then output= 31 July 2008

Please advice

Regards,
Suresh
 

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GMDATE(3)								 1								 GMDATE(3)

gmdate - Format a GMT/UTC date/time

SYNOPSIS
string gmdate (string $format, [int $timestamp = time()]) DESCRIPTION
Identical to the date(3) function except that the time returned is Greenwich Mean Time (GMT). PARAMETERS
o $format - The format of the outputted date string. See the formatting options for the date(3) function. o $timestamp - The optional $timestamp parameter is an integer Unix timestamp that defaults to the current local time if a $timestamp is not given. In other words, it defaults to the value of time(3). RETURN VALUES
Returns a formatted date string. If a non-numeric value is used for $timestamp, FALSE is returned and an E_WARNING level error is emitted. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.1.0 | | | | | | | The valid range of a timestamp is typically from | | | Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 | | | 03:14:07 GMT. (These are the dates that corre- | | | spond to the minimum and maximum values for a | | | 32-bit signed integer). However, before PHP 5.1.0 | | | this range was limited from 01-01-1970 to | | | 19-01-2038 on some systems (e.g. Windows). | | | | | 5.1.1 | | | | | | | There are useful constants of standard date/time | | | formats that can be used to specify the $format | | | parameter. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 gmdate(3) example When run in Finland (GMT +0200), the first line below prints "Jan 01 1998 00:00:00", while the second prints "Dec 31 1997 22:00:00". <?php echo date("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998)); echo gmdate("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998)); ?> SEE ALSO
date(3), mktime(3), gmmktime(3), strftime(3). PHP Documentation Group GMDATE(3)
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