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Free Date And Time Tools
Use date and time tools when a calendar, duration, time zone, timestamp, or work-hours detail changes the answer. These pages make the input labels visible so you can catch wrong dates, time zones, and start or end values before copying a result.
Browse and filter date & timeAll date and time tools
Choose a tool for your task. Open its matching guide when you need the inputs or results explained.
Age CalculatorCalculate exact calendar age in years, months, days, and total days.Date CalculatorAdd or subtract days from a date, or count full days between two dates.Time CalculatorAdd or subtract hours, minutes, and seconds with normalized H:M:S, total seconds, and decimal hours.Hours CalculatorCalculate hours worked between start and end times with breaks and optional pay.Time Card CalculatorAdd weekday shifts, breaks, total hours, and optional gross pay.Time Zone CalculatorConvert a UTC date and time into a selected IANA time zone.
Browse all 8 date & time
The 6 choices above and these 2 tools make up this category.
- Day of the Week CalculatorFind the weekday name and ISO weekday number for a calendar date.
- Unix Timestamp ConverterConvert UTC dates to Unix timestamps and Unix timestamps back to UTC date-time strings.
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What this category helps with
- Date, age, time, and hours calculators for planning, schedules, deadlines, and time-card math.
- Calendar-aware helpers that explain whether they are counting dates, durations, or clock times.
- Private in-browser answers with examples and guide pages for common date and time mistakes.
Guides for this category
Each guide uses its matching tool, with example numbers and plain limits.
- Age Calculator GuideUse the Age Calculator guide to enter a birth date, choose an as-of date, read exact age, check total days, and avoid leap-day or cutoff mistakes.
- Date Calculator Guide: Add or Subtract DaysLearn how to add or subtract days, weeks, months, and years from a date, count days between dates, and check 90-day and month-end examples.
- How to use the Time CalculatorUse the Time Calculator guide to add or subtract hours, minutes, and seconds, then read normalized H:M:S, total seconds, and decimal hours.
- How to use the Hours CalculatorUse the Hours Calculator guide to turn start time, end time, unpaid breaks, and optional hourly rate into worked hours, decimal hours, and gross pay.
- How to use the Time Card CalculatorLearn how to total work hours from daily start times, end times, and breaks. Includes input tips, examples, result checks, and unit or mode notes for the Ti...
- How to use the Time Zone CalculatorUse the Time Zone Calculator guide to convert 2026-04-30 12:00 UTC to New York, London, Tokyo, or another IANA zone, with DST and date-change checks.
Browse all 8 guides in this category
- How to use the Day of the Week CalculatorUse the Day of the Week Calculator guide to find weekday names, ISO weekday numbers, and Sunday-based indexes for valid calendar dates.
- How to use the Unix Timestamp ConverterLearn how to convert UTC dates to Unix timestamps and timestamps back to UTC time. Includes input tips, examples, result checks, and unit or mode notes for...