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https://www.unix.com/shell-programming-and-scripting/138342-perl-extract-12-hour-time-convert-24-subtract-15-minutes.html#:~:text=What%20I%20need%20to%20do%20is%20open%20the,happen%29.%20Then%20do%20the%20same%20for%20the%20End.
https://stackoverflow.com/questions/19767816/how-to-subtract-two-hhmmss-times-from-each-other-in-perl
I need to subtract one time from another using Perl. Both times are in the HH:MM:SS format. ... and so on for the minutes and hours, and then get calculate the total time passed by converting each result to seconds and adding them up. ... was 23:59:09, the actual number of seconds that have passed is 10, but the calculation would give 09-59 ...
https://stackoverflow.com/questions/6678398/substract-15-minutes-from-time-using-perl
I thought this was going to be very simple but I am really out of options now. I want to substract 15 minutes from a given time. Example My time is 15:04 I want to substract 15 minutes to be 14:49. I have searched for solutions on the internet but there is no perl module that can help me out.
https://www.oreilly.com/library/view/perl-cookbook/1565922433/ch03s05.html
Adding to or Subtracting from a Date Problem You have a date and time and want to find the date and time of some period in the future or past. … - Selection from Perl Cookbook [Book]
https://www.unix.com/shell-programming-and-scripting/138342-perl-extract-12-hour-time-convert-24-subtract-15-minutes.html
What I need to do is open the file, pull the Start which is in 12Hour time, convert to 24Hour time and create a cron entry based on this. Also subtract 15 minutes from the above time and create another cron entry (to kick off a warning that something is about to happen). Then do the same for the End.
https://perlmaven.com/datetime
Add and Subtract from a date. In order to calculates dates relative to a given date we can use DateTime::Duration objects. After loading the module into memory we can create DateTime::Duration objects and use them to add to DateTime object or to subtract from them. examples/datetime_arithmetic.pl
https://metacpan.org/pod/DateTime
The hour as a decimal number using a 24-hour clock (range 00 to 23). %I. The hour as a decimal number using a 12-hour clock (range 01 to 12). %j. The day of the year as a decimal number (range 001 to 366). %k. The hour (24-hour clock) as a decimal number (range 0 to 23); single digits are preceded by a blank. (See also %H.) %l
https://www.tek-tips.com/viewthread.cfm?qid=1555637
You'll have to subtract the dates, to see how far apart they are, then compare them with a DateTime::Duration object that represents 24 hours. The 'compare' function returns 1 if the first duration is greater (i.e. the difference is greater than 24 hours), 0 if they're equal and -1 if the second is greater (i.e. less than 24 hour difference).
https://www.unix.com/shell-programming-and-scripting/245007-add-subtract-hours-minutes-seconds-time-variable.html
Add or Subtract the hours,minutes or seconds in the the time variable. ... Perl - Extract 12 hour time, convert to 24 and subtract 15 minutes? OK, I am by no means a programmer... I have been given the task to do some automation scripts. I have got most of it working from snippets I have found on the Web. One requirement has me stumped.
https://www.codegrepper.com/code-examples/python/subtract+24+hours+from+datetime+python
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