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How-to

  • The core functions, which every industry uses.

Each page answers one question, shows the call, works one example through, and says which version of GMT produced the results.

QuestionPage
How do I add business days when the weekend is not Saturday and Sunday?Add business days
How do I show one moment in another time zone?Convert a time between time zones
How do I check whether a wall-clock time exists on a day the clocks change?Check whether a local time exists on a DST day
Which library handles time zones and DST, and what does each return for a time that does not exist?Time zones and DST in JavaScript: which date library handles them

Code examples: MIT-0. Packages: MIT. Third-party data and components: their own licences, credited where they appear. Everything else:© 2026 NorthGuild, all rights reserved.