Date & Time Tools

Convert time zones, count business days and calculate durations.

Time Zone ConverterConvert an instant between IANA time zones.World ClockLive clocks across your chosen cities.Business Days CalculatorCount working days between two dates, skipping weekends and holidays.Countdown TimerLive countdown to any date-time, second by second.Time Duration CalculatorElapsed time between two clock times.Date CalculatorAdd or subtract days, weeks, months or years from a date.Week Number CalculatorISO 8601 week number for any date.Time Ago CalculatorHuman-readable relative time from any date-time.

About these date & time tools

Calendar and clock maths built on the browser's Intl engine: correct daylight saving, ISO week numbers, month-end clamping and UTC-safe date arithmetic.

Each tool is a small, focused utility with its own page, its own instructions and its own set of supported inputs. There is no account to create and no server-side processing step: the work happens on your device.