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Top Forums Shell Programming and Scripting concatenate files sorted by date Post 302203436 by mschwage on Sunday 8th of June 2008 11:14:11 PM
Old 06-09-2008
Problem number 1 is you're mixing date math with integer math. You cannot add 1 to your "0530" and expect to get the next day. For example, there is no integer "0530". There is an integer "530", however, and if you add 1 to it you will get "531". ...NOT the "0531" that you need. And, as you mentioned, adding 1 to that will not get you into June.

The problem of shell date arithmetic is fairly difficult. See "Date math in Linux shell script?": Tech Support from Ask Dave Taylor! .

When you do your comparison, you can test for your end condition in either of two ways:
  • If the current date == the end date (string comparison)
  • If the current iterations number of seconds since the epoch is less than or equal to the end date's number of seconds since the epoch.
Also, here's a couple of more gotchas you need to be aware of. If you do your date math using "number of seconds since the Epoch",
  • You may want your first date to actually be midnight of the first date- that is, the 0'th second of that day.
  • You may want your second date to actually be 23:59:59 on that day.
This is because if you do your "begin <= end" comparison, you may be comparing 3pm on the end day to 2pm on the end day and that iteration of the script will not run.

I mention that because it's convenient to actually do the date math by:
  1. Convert the first date to the number of seconds since the epoch
  2. Increment the date by adding 86,400 (the number of seconds in a day) to the date for each iteration.
You also must be aware of when the year changes. Don't forget you may be comparing dates in January to dates in December.
-mschwage
 

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DATETIME.SETDATE(3)							 1						       DATETIME.SETDATE(3)

DateTime::setDate - Sets the date

       Object oriented style

SYNOPSIS
public DateTime DateTime::setDate (int $year, int $month, int $day) DESCRIPTION
Procedural style DateTime date_date_set (DateTime $object, int $year, int $month, int $day) Resets the current date of the DateTime object to a different date. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3). The function modifies this object. o $year - Year of the date. o $month - Month of the date. o $day - Day of the date. 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.setDate(3) example Object oriented style <?php $date = new DateTime(); $date->setDate(2001, 2, 3); echo $date->format('Y-m-d'); ?> Procedural style <?php $date = date_create(); date_date_set($date, 2001, 2, 3); echo date_format($date, 'Y-m-d'); ?> The above examples will output: 2001-02-03 Example #2 Values exceeding ranges are added to their parent values <?php $date = new DateTime(); $date->setDate(2001, 2, 28); echo $date->format('Y-m-d') . " "; $date->setDate(2001, 2, 29); echo $date->format('Y-m-d') . " "; $date->setDate(2001, 14, 3); echo $date->format('Y-m-d') . " "; ?> The above example will output: 2001-02-28 2001-03-01 2002-02-03 SEE ALSO
DateTime.setISODate(3), DateTime.setTime(3). PHP Documentation Group DATETIME.SETDATE(3)
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