datetime - How to re-calculate the time-stamps (from the past) to UTC using bash -


i have text file (data.txt) contains time-stamps expressed in local time-zone (cest):

example:

2015-05-13   23:12:11 2015-05-14   00:13:23 2015-05-14   07:12:13 2015-05-14   08:34:45 2015_05-14   19:39:44

i have write bash script re-calculates these time-stamps utc (cest=utc+2hrs).

the expected output file: 

2015-05-13   21:12:11 2015-05-13   22:13:23 2015-05-14   05:12:13 2015-05-14   06:34:45 2015_05-14   17:39:44

i used date command many options (-d , -u) no effect. i'd grateful suggestions.

i can generate example via options you've tried:

$ date +"%f  %t" -d "2015-05-13   23:12:11 cest" -u 2015-05-13  21:12:11

stick in loop , you'll able operate on whole file.


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