Convert local time with the edge cases intact
Enter a wall-clock reading and named zones. Ambiguous and nonexistent local times are explained instead of silently adjusted.
Conversion details
Try an example
Prepared clock-change cases
Load an ordinary conversion, a repeated hour or a skipped hour to see how date-aware conversion behaves.
A direct summer conversion with no clock ambiguity.
New York 01:30 occurs twice when daylight time ends.
New York 02:30 does not occur when daylight time begins.
Date-aware calculation: all supported IANA time zones can be converted; examples demonstrate difficult clock-change cases.