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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.
guides available
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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.
Start with these tools
Age Calculator Calculate exact calendar age in years, months, days, and total days. Date Calculator Count days between dates or move a calendar date forward or backward. Time Calculator Add or subtract hours, minutes, and seconds with normalized H:M:S, total seconds, and decimal hours. Hours Calculator Calculate hours worked between start and end times with breaks and optional pay. Time Card Calculator Add weekday shifts, breaks, total hours, and optional gross pay. Time Zone Calculator Convert a UTC date and time into a selected IANA time zone.
All date and time tools
Open a tool, try the examples, then use the matching guide when you need more explanation.
Age Calculator Calculate exact calendar age in years, months, days, and total days. Open Date Calculator Count days between dates or move a calendar date forward or backward. Open Time Calculator Add or subtract hours, minutes, and seconds with normalized H:M:S, total seconds, and decimal hours. Open Hours Calculator Calculate hours worked between start and end times with breaks and optional pay. Open Time Card Calculator Add weekday shifts, breaks, total hours, and optional gross pay. Open Time Zone Calculator Convert a UTC date and time into a selected IANA time zone. Open Day of the Week Calculator Find the weekday name and ISO weekday number for a calendar date. Open Unix Timestamp Converter Convert UTC dates to Unix timestamps and Unix timestamps back to UTC date-time strings. Open
Guides for this category
Each guide uses its matching tool, with example numbers and plain limits.
Age Calculator Guide
Use 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.
Read Age Calculator guideDate Calculator Guide
Count days between dates, add 45 days, or check month-end shifts without vague calendar math. Includes input tips, examples, result checks, and unit or mode...
Read Date Calculator guideHow to use the Time Calculator
Use the Time Calculator guide to add or subtract hours, minutes, and seconds, then read normalized H:M:S, total seconds, and decimal hours.
Read Time Calculator guideHow to use the Hours Calculator
Use the Hours Calculator guide to turn start time, end time, unpaid breaks, and optional hourly rate into worked hours, decimal hours, and gross pay.
Read Hours Calculator guideHow to use the Time Card Calculator
Learn 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...
Read Time Card Calculator guideHow to use the Time Zone Calculator
Learn how to convert a UTC date and time into an IANA time zone. Includes input tips, examples, result checks, and unit or mode notes for the Time Zone Calc...
Read Time Zone Calculator guideHow to use the Day of the Week Calculator
Learn how to find the weekday for any valid calendar date. Includes input tips, examples, result checks, and unit or mode notes for the Day of the Week Calc...
Read Day of the Week Calculator guideHow to use the Unix Timestamp Converter
Learn 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...
Read Unix Timestamp Converter guide