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Convert an actual source date/time with IANA zones and DST rules.
Online timer and stopwatch.
View the current date, time, and UTC offset in selected IANA zones
Run configurable focus, short-break, and long-break intervals
Count real elapsed time to a target in the browser's local zone
Calculate days between two dates.
Add or subtract days/months/years from a date.
Find the day of week for any date.
Check if a year is a leap year.
Convert Unix timestamps to dates.
Calculate meteorological-season boundaries for a selected date and hemisphere.
Calculate business days between dates
Find the week number of a date
Count days until a specific date
Find what day your birthday falls on
Calculate difference between two dates
Generate all dates in a range
Convert real instants with IANA zones, including DST gaps and folds
Calculate difference between two times
Add or subtract hours/minutes/seconds
Convert hours to minutes/seconds
Convert minutes to hours:minutes
Calculate work hours from clock in/out
Convert between 12h and 24h format
Separate South Korea's international-age default from traditional counting age
Display a Gregorian date in the browser's Unicode East Asian lunisolar calendar
Find your zodiac sign
Find the zodiac animal from a birth date and the lunisolar New Year boundary
Load public holidays for a selected country and year from a public API
Measure elapsed time and laps from an absolute start-time anchor
Play browser audio and an optional notification while this tab remains open
Calculate time elapsed since a date
Count real remaining time to the immediately next local New Year
Compare work-hour overlap across IANA zones on an actual DST-aware date
Build sleep/wake schedule candidates from a user-selected interval and allowance