Add try_to_rfc3339
and to_iso8601
, deprecate to_rfc3339
#1331
Open
pitdicker wants to merge 3 commits intochronotope:mainfrom pitdicker:try_to_rfc3339
+111-27
try_to_rfc3339
and to_iso8601
, deprecate to_rfc3339
#1331