Date & Time Tools

Date and time calculations for scheduling and time-zone coordination — time zone and UTC conversion, a world clock, date arithmetic (adding or subtracting days or time), business-hours and duration calculations, and calendar facts like week numbers and leap years.

Coordinating a meeting across regions uses Time Zone Converter or World Clock to see several zones at once; UTC Converter is for logs and systems that store timestamps in UTC. Date math splits by what's being added or subtracted: Add or Subtract Days Calculator for whole days, Add or Subtract Time Calculator for hours and minutes, and Time Duration Calculator for the elapsed time between two points. Business Hours Calculator accounts for working hours only, skipping evenings and weekends — useful for support SLAs. Calendar lookups (Week Number Calculator, Day of Year Calculator, Leap Year Checker) answer one-off scheduling questions. Countdown Timer runs a live countdown to a specific moment.

A remote team schedules a meeting across three time zones using World Clock; a support team calculates whether a ticket is still within its SLA using Business Hours Calculator; a developer converts a UTC log timestamp to their local time zone; an event organizer runs a countdown timer to a launch date.