Add or Subtract Days
Move a calendar date forward or backward.
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MADE FOR THE EVERYDAY
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Age Calculator
Calculate completed years, months and days between a birth date and a reference date.
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Business Days
Count Monday–Friday dates from the start date inclusive to the end date exclusive, excluding your holiday list.
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Calendar Generator
Create a Monday-first monthly calendar with ISO dates and download its day-by-day data.
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Countdown
Count down to an exact future date and time in a selected IANA time zone.
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Date Difference
Count calendar days between two dates.
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Date Format Converter
Convert a strict ISO calendar date into selected numeric date layouts and a localized long date.
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Day of Week Finder
Find the localized weekday and ISO weekday number (Monday = 1) for a date.
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Day of Year
Find the ordinal day of the year and the number of remaining calendar days.
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ISO Date Converter
Convert an ISO timestamp with an explicit UTC offset to UTC, Unix seconds and milliseconds.
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ISO Week Number
Find the ISO week number and week year.
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Leap Year Checker
Check the Gregorian leap-year rule for the selected date’s year.
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Meeting Time Converter
Show the same meeting instant in several IANA time zones. Ambiguous or nonexistent local times are rejected.
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Months Between Dates
Calculate complete calendar months and remaining days; months use calendar boundaries, not a fixed day count.
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Pomodoro
Alternate adjustable focus and rest intervals with a visible countdown and cycle counter.
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Quarter Finder
Find the calendar quarter and its inclusive start and end dates.
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Recurring Date Generator
Generate dates at a daily, weekly, monthly or yearly interval. Each date is anchored to the original date; invalid month-end days clamp to that month’s last day.
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Stopwatch
Measure elapsed time with start, pause, reset and lap records in this tab.
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Time Difference
Calculate nominal elapsed time between two local date-times. Time zones and daylight-saving changes are not applied.
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Time Duration Average
Average durations entered one per line as HH:MM or HH:MM:SS, with optional millisecond fractions.
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Time Duration Sum
Sum durations entered one per line as HH:MM or HH:MM:SS, with optional millisecond fractions.
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Timer
Set a countdown duration with quick presets, pause and resume.
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Timezone Converter
Convert a local date-time from one IANA time zone to another. Ambiguous or nonexistent local times are rejected.
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Unix Timestamp Converter
Convert Unix seconds or milliseconds to an ISO date.
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