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https://stackoverflow.com/questions/28702872/perl-datetime-module-how-to-compare-two-datetimes-for-a-24-hour-time-lapse
If it is indeed 24 hours as you have requested (there is a difference on days where daylight saving time starts or stops) then you can change it by writing use Time::Seconds 'ONE_HOUR' and $diff >= ONE_HOUR * 24 instead.
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://www.oreilly.com/library/view/perl-cookbook/1565922433/ch03s05.html
Calculating with Epoch seconds is easiest, disregarding the effort to get dates and times into and out of Epoch seconds. This code shows how to calculate an offset (55 days, 2 hours, 17 minutes, and 5 seconds, in this case) from a given base date and time:
https://grabthiscode.com/csharp/c-subtract-24-hours-form-datetime
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http://www.easysurf.cc/tmadd.htm
Directions. Add or Subtract hours and/or minutes. Enter first hours and minutes "From:" Enter second hours and minutes below "From:" When you subtract, the greater number of hours and minutes should be entered first. Select add or subtract. The hours entered must be a positive number or zero (0).
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://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 …
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