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                        on
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                            Prototype: on(year, month, day, hour, minute, second)
Return type: int
Description: Returns the specified date/time in integer system representation.
The specified date/time is an absolute date in the local timezone.
Arguments:
- year:- int, in the range:- 1970,3000
- month:- int, in the range:- 0,1000
- day:- int, in the range:- 0,1000
- hour:- int, in the range:- 0,1000
- minute:- int, in the range:- 0,1000
- second:- int, in the range:- 0,1000
Example:
    body file_select zero_age
    {
      mtime       => irange(on(2000,1,1,0,0,0),now);
      file_result => "mtime";
    }
Notes: In process matching, dates could be wrong by an hour depending on Daylight Savings Time / Summer Time. This is a known bug to be fixed.