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I am looking to get a time range from a given time. The start time should be 60 mins before the given time and end time should be 60 mins after the given time.

Purpose: The given time will be like an 'impact time', I am looking to get a suitable range of time around the impact time to be able to grab logs.

Example : Given time is 2018-05-16 20:30:00 This is of the format '%Y-%m-%d %H:%M:%S'

Please help me get: Start time is 2018-05-16 19:30:00 End time is 2018-05-16 21:30:00

This is going to run on a server that will be in PDT/PST always and the date-time is of the format '%Y-%m-%d %H:%M:%S'

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    Timezones have an effect on time, I’m afraid...
    – Jeff Schaller ♦
    May 16, 2018 at 23:43
  • @JeffSchaller Sorry for the confusion , This script is going to run on a server that will be in PDT/PST always
    – Sierra
    May 16, 2018 at 23:56
  • Transitions between PDT and PST affect the time, too.
    – Jeff Schaller ♦
    May 17, 2018 at 0:02

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Assuming the timezone is set correctly, and GNU date, you can get the Unix timestamp, subtract, add 60 minutes and convert it back to the format needed:

$ ts=$(date -d "2018-05-16 21:30:00" +%s)  # For BSD date: date -jf "%F %T" "2018-05-16 21:30:00" +%s 
$ echo "$(date -d@$((ts - 3600)) +"%F %T")"
2018-05-16 20:30:00
$ echo "$(date -d@$((ts + 3600)) +"%F %T")"
2018-05-16 22:30:00

... I think this doesn't correctly account for leap seconds and various other problems every programmer should know about time.

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  • This does not seem to work, I'm getting some weird year like 1972 ! does this command depend on the linux version ? Mine is Linux meade 3.10.0-693.11.6.el7.x86_64 #1 SMP Thu Dec 28 14:23:39 EST 2017 x86_64 x86_64 x86_64 GNU/Linux and the output i got was : + date -d@-3600 '+%F %T' + sBegindate='1969-12-31 15:00:00' + date -d@3600 '+%F %T' + sEnddate='1969-12-31 17:00:00' + print ' Start date 1969-12-31 15:00:00 and End date 1969-12-31 17:00:00' Start date 1969-12-31 15:00:00 and End date 1969-12-31 17:00:00
    – Sierra
    May 17, 2018 at 18:22
  • Uh, why are you doing date -d@-3600 and date -d@3600? 3600 seconds before and after the Unix epoch would of course be around 1970.
    – Olorin
    May 18, 2018 at 6:16

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