Shell timestamp conversion aliases

timestamp.sh

alias to-timesptamp-ms="python3 -c 'import datetime, sys; s = sys.argv[1]; s = s[:-1] if s[-1] == \"Z\" else s; print(round(datetime.datetime.fromisoformat(s).replace(tzinfo=datetime.timezone.utc).timestamp() * 1000))'"
alias from-timesptamp-ms="python3 -c 'import datetime, sys; t = int(sys.argv[1]); print(datetime.datetime.utcfromtimestamp(t/1000).strftime(\"%Y-%m-%dT%H:%M:%S.%f\")[:-3]+\"Z\")'"from-timesptamp-ms