Strong Matcher for ISO 8601 / RFC 3339 Date Times; rejects bad TZ offsets, illegal times (Museum of Bad Data)
Handles many nuanced cases around time zone offsets, leap seconds and leap days.
List of UTC Offsets
RFC 3339, the stricter rules that most systems use in practice
ISO 8601, the widely known name for this format...
Submitted by Philip Flip Kromer (@mrflip) - a month ago