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I am working with a timestamp which is in the following format which I am told is know as ISO 8601 :

2016-04-27T14:14:47.836Z

I would like to be able to calculate the timestamp both 15 minutes and 30 minutes before the current timestamp.

UPDATE: I need the output to be in the same format as the original timestamp

I have some code which retrieves the timestamp at any given time, but how can I get a script to calculate the timestamp at a given number of minutes before the current timestamp- for this example I would like to know both 15 minutes and 30 minutes before.

Any help appreciated.

1

The first point of call would be

man date

There you may find the details on setting time with a relative offset, as in

date --date '-15 minutes 2016-04-27T14:14:47.836Z'

It also offers details about how to format the output.

  • Thanks for the response. I tried this and it works in terms of calculating the time, but the output is in a different format to the timestamp- I need the output to be in the same format as the original timestamp, I've updated my original question with this info. – neilH Apr 27 '16 at 14:55
  • if you read further down the man page for date it shows you how to format the output, of the top of my head it could be: date --date '-15 minutes 2016-04-27T14:14:47.836Z' "+%Y-%m-%dT%H:%I:%S" but I may be mixing things up, so do man date and check – Cwissy Apr 27 '16 at 15:12
  • Thanks, the formatting code you suggested worked as I wished thanks. The issue I have now is for some reason the '-15 minutes 2016-04-27T14:14:47' part is taking off many hours! I created a new question for this here unix.stackexchange.com/questions/279791/… – neilH Apr 28 '16 at 17:08

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