Current local time in an IANA timezone, with UTC offset, abbreviation and DST flag. Use whenever you need to know 'now'.

Convert a date/time from one IANA timezone to another. Accepts ISO 8601 or natural language ('next Tuesday 3pm'). Returns converted datetime, offset, abbreviation and DST flag.

Like convert_timezone but converts a single instant into many target timezones at once. Ideal for world-clock views.

Exact UTC offset of a timezone at a given instant (DST-aware). Handles fractional offsets like India +05:30 and Nepal +05:45.

List or search valid IANA timezone names. Filter by city, region or country substring (e.g. 'kolkata', 'america').

Resolve a city or country name to its IANA timezone(s), so you don't need the exact identifier. E.g. 'Delhi' -> Asia/Kolkata.

Add/subtract time to a date respecting DST (days are calendar-based, hours/minutes are absolute), or compute the difference between two datetimes in different zones.

Suggest the best overlapping working-hour slots for a meeting across timezones. Excludes weekends and (if a country code is given per participant) public holidays.

Check whether a date is a public holiday in a country (ISO 3166-1 alpha-2). Data from the free Nager.Date service.