How should I enter birth time, time zone, and daylight saving time?

The clock time used in the birth record

Enter the clock time used at the birthplace at that time, keeping the birth date and location. If the record uses another region’s time, mention this too so conversion has a clear basis.

Pay particular attention to the date near midnight. Early morning in one place may still be the previous day in another time zone.

Daylight saving time follows historical rules

A city may have used different UTC offsets in different years, or observed daylight saving time. The website uses the birth date and location to look up the rules then in force in the IANA time zone database.

Compare times before and after conversion

If charts differ, first check the date, local time and selected city, then the time zone and UTC time interpreted by the system. Similar place names may refer to different regions.

If a record uses 24:00, the Zi hour, or another traditional notation, first establish which date it belongs to and retain the original notation so the conversion can be traced.