What is the most efficient way to get a unix timestamp for a given ISO 8601 date and vice versa?
There are several third party websites to do this. However I am looking for a simple command that can be executed at the Linux prompt
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The goal is that you add some code of your own to show at least the research effort you made to solve this yourself. – Cyrus Dec 08 '17 at 06:22
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Convert ISO Date/Time to Unix timestamp
date -d 'date' +"%s"
Example
bash-# date -d 'Fri Dec 8 00:12:50 UTC 2017' +"%s"
bash-# 1512691970
man -a date
-d, --date=STRING
display time described by STRING, not 'now'
%s seconds since 1970-01-01 00:00:00 UTC
Convert Unix timestamp to ISO Date/Time
date -Iseconds -d @<unix timestamp>
Example
bash-# date -Iseconds -d @1512711426
bash-# 2017-12-07T21:37:06-0800
man -a date
-d, --date=STRING
display time described by STRING, not 'now'
-I[TIMESPEC], --iso-8601[=TIMESPEC]
output date/time in ISO 8601 format.
TIMESPEC='date' for date only (the default), 'hours',
'minutes', 'seconds', or 'ns' for date and time to the
indicated precision.
