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Top Forums Shell Programming and Scripting Get yesterday's date in year-month-day format? Post 302326472 by tiger2000 on Thursday 18th of June 2009 04:16:42 AM
Old 06-18-2009
Get yesterday's date in year-month-day format?

Dear All,

Actually, i'm doing some reporting job and i need to pass yesterday's date in Year-Month-Day format(e.g. 2009-06-10) to another program for generating 2009-06-10 report.


to get today's date, it's easy to just date '+%Y%m%d' , but no idea how can i get this kind of format for yesterday?

echo "`date '+%Y%m%d'` - 1 " | bc seems not the correct way for this, because it will go wrong on the beginning date of each month.
( e.g. 20090601 - 1 will have problem.)

how about converting the date string in '+%s' format back to '+%Y%m%d' format? is this possible? for instance :
echo "`date '+%Y%m%d'` - 86400" | bc | <command to convert back to regular date format probaby by date command> ?
(86400 = 60 seconds * 60 minutes * 24 hours)

any advice on this? I'm sorry if this makes you confusing...
 

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DATETIME.SETTIME(3)							 1						       DATETIME.SETTIME(3)

DateTime::setTime - Sets the time

       Object oriented style

SYNOPSIS
public DateTime DateTime::setTime (int $hour, int $minute, [int $second]) DESCRIPTION
Procedural style DateTime date_time_set (DateTime $object, int $hour, int $minute, [int $second]) Resets the current time of the DateTime object to a different time. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3). The function modifies this object. o $hour - Hour of the time. o $minute - Minute of the time. o $second - Second of the time. RETURN VALUES
Returns the DateTime object for method chaining or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | Changed the return value on success from NULL to | | | DateTime. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 DateTime.setTime(3) example Object oriented style <?php $date = new DateTime('2001-01-01'); $date->setTime(14, 55); echo $date->format('Y-m-d H:i:s') . " "; $date->setTime(14, 55, 24); echo $date->format('Y-m-d H:i:s') . " "; ?> Procedural style <?php $date = date_create('2001-01-01'); date_time_set($date, 14, 55); echo date_format($date, 'Y-m-d H:i:s') . " "; date_time_set($date, 14, 55, 24); echo date_format($date, 'Y-m-d H:i:s') . " "; ?> The above examples will output something similar to: 2001-01-01 14:55:00 2001-01-01 14:55:24 Example #2 Values exceeding ranges are added to their parent values <?php $date = new DateTime('2001-01-01'); $date->setTime(14, 55, 24); echo $date->format('Y-m-d H:i:s') . " "; $date->setTime(14, 55, 65); echo $date->format('Y-m-d H:i:s') . " "; $date->setTime(14, 65, 24); echo $date->format('Y-m-d H:i:s') . " "; $date->setTime(25, 55, 24); echo $date->format('Y-m-d H:i:s') . " "; ?> The above example will output: 2001-01-01 14:55:24 2001-01-01 14:56:05 2001-01-01 15:05:24 2001-01-02 01:55:24 SEE ALSO
DateTime.setDate(3), DateTime.setISODate(3). PHP Documentation Group DATETIME.SETTIME(3)
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