Date and time
Calculate dates, durations and time entries, and create calendars with explicit options and local processing.
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Business days calculator
Count business days between two dates using your chosen weekends and manual holidays, with explicit endpoint inclusion.
Duration calculator
Add durations beyond 24 hours or subtract them sequentially without decimal drift, including milliseconds and negative values.
Unix timestamp converter
Convert integer Unix timestamps and exact UTC date-times, and display the same instant in a selected IANA zone without guessing units.
ISO week calculator
Find the ISO week number, week year, weekday and Monday–Sunday boundaries, or convert a week year and number to dates.
Timesheet calculator
Total dated time intervals with explicit breaks, overlap rejection, next-day endings and CSV export.
Printable calendar generator
Generate a Gregorian month or year with a chosen first weekday and download a standalone printable HTML calendar.
Countdown timer
Count down a duration or a fixed local deadline with an explicitly chosen UTC offset, verified against the browser’s time zone.
Time zone converter
Convert a local time between IANA zones, rejecting nonexistent times and explicitly choosing between instants when a time repeats.