Time & Date Tools6 tools

Time and date tools that stop the mental arithmetic

Time math is the kind of work that feels easy right up until it is wrong. A meeting lands at 4am because somebody subtracted instead of adding, a contract deadline slides because nobody subtracted the weekends, a bug report has three timestamps in three formats and none of them agree. The tools in this group do that arithmetic properly, in your browser, with nothing uploaded.

The time zone converter shows one moment across every city you care about, side by side, with day-offset badges so the +1 day surprise is visible before you hit send on the invite. It reads the browser's own IANA zone database, which means daylight saving shifts are already accounted for, including the weeks when the US has moved and Europe has not.

The business days calculator answers the two questions contracts keep asking: how many working days sit between two dates, and where do I land if I add ten business days to today. It skips weekends automatically and takes a list of holidays from you rather than guessing them, because holiday calendars differ by country, by state and by year, and a tool that pretends otherwise is quietly wrong.

The timestamp converter translates Unix time in both directions and works out for itself whether you pasted seconds, milliseconds or microseconds. Developers live in that tool during debugging; if that is you, the JWT decoder next door reads token expiry times the same way. And the date difference calculator does plain calendar gaps for everything else.

Two pull live data for the questions a calendar cannot answer alone. The public holidays checker lists official holidays for over a hundred countries and any year, and its dates paste straight into the business days calculator, while the weather forecast gives seven days for any city from open data, including the rain probability that people routinely misread.

Nothing here needs an account, nothing leaves your machine, and everything works offline once the page is open. Time zones are confusing enough without a loading spinner.