How to print ISO8601 date using 'date' on command line

Use one of these commands to print the ISO8601 time using the date tool included in most Linux distributions.

example.sh

date -I # 2019-04-06
date -Iseconds # 2019-04-06T17:22:49+02:00
date -Ins # 2019-04-06T17:23:08,505995625+02:00

date -I # 2019-04-06
date -Iseconds # 2019-04-06T17:22:49+02:00
date -Ins # 2019-04-06T17:23:08,505995625+02:00

For reference see the date manpage.

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