Time zones, timestamps and date standards
in one clear view.
5 calculators in this category · Browse by topic or open a tool directly.
Julian ISO Date Converter
Separate ordinal dates, ISO week dates and astronomical Julian Day so the overloaded term stays unambiguous. Inputs stay in your browser.
CalculatorMilitary Time Converter
Convert one local clock time between 12-hour, coloned 24-hour and four-digit military-style notation. Inputs stay in your browser.
CalculatorMeeting Time Planner
Convert a local meeting instant between searchable IANA time zones with DST gap and ambiguity handling. Inputs stay in your browser.
CalculatorTime Unit Converter
Convert fixed time units and clearly label average Gregorian month or year assumptions where exact factors do not exist. Inputs stay in your browser.
CalculatorUnix Timestamp Converter
Convert Unix seconds or milliseconds to an ISO 8601 UTC instant and show the reversible timestamp values. Inputs stay in your browser.
Calculator