fixed a time zone bug of BEFORE, AFTER value

[jihoonparkk]

Please review and merge it.

[pferrel]

what versions of macOS has this been tested on?

[jihoonparkk]

macOS High Sierra (version 10.13.3)

[pferrel]

Odd, I get no errors on macOS High Sierra. Does this have to do with the your timezone vs mine?

[jihoonparkk]

My timezone. I'm in South Korea using +09:00 UTC offset.

For example, my local time is assumed to be "2018-03-26 01:00:00."

• Previous Code
  date -v +0d +"%Y-%m-%dT%H:%M:%SZ"
  => The result is "2018-03-26T01:00:00Z" in ISO 8601 format. Same time is "2018-03-25T16:00:00+09:00." It's different to my local time.

• Fixed Code
  date -v +0d -u +%FT%TZ
  => The result is "2018-03-25T16:00:00Z" in ISO 8601 format. Same time is "2018-03-26T01:00:00+09:00." It's same to my local time.