Methodology
Calendar calculations use Gregorian calendar rules. Time-zone calculations use standard IANA identifiers through browser Intl APIs; results depend on the browser’s installed time-zone data.
Time / DateTime zones, dates and intervalsTime / DateTime zones, dates and intervalsCalendar calculations use Gregorian calendar rules. Time-zone calculations use standard IANA identifiers through browser Intl APIs; results depend on the browser’s installed time-zone data.