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by 3np 948 days ago
FWIW these bash shortcuts are handy if you do this a lot:

    tss() { date -Is -u -d @$1 ; }
    tsm() { date -Ins -u -d @$( echo "scale=3; $1 / 1000" | bc) | sed -E -e 's/[0-9]{6}\+/\+/' -e 's/,/./' ; }
    tsn() { date -Ins -u -d @$( echo "scale=9; $1 / 1000000000" | bc) | sed 's/,/./' ; }

    $ tss 1700000000
    2023-11-14T22:13:20+00:00

    $ tsm 1700000000000
    2023-11-14T22:13:20.000+00:00

    $ tsn 1700000000000000000
    2023-11-14T22:13:20.000000000+00:00