Just like any other language convert your time periods to a unix timestamp ie seconds since the unix epoch and then simply subtract then the resulting seconds should be used as a new unix timestamp and read formatted in whatever format you want.
The number of 86400 seconds in a day comes from the assumption of 60 seconds per minute 60 minutes per hour and 24 hours per day 606024 but not every day has 24 hours.
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New dateyear month date hours minutes seconds ms create the date with the given components in the local time zone only two first arguments are obligatory.
Can anybody please tell me how to get the current timestamp upto milliseconds using either sortdfsorticetool if i use any of formats like time1time2time3 it gives only upto seconds.