19available tools
Free, fast utilities available without creating an account.
Category
Dates & time
Calculate ages, durations, date differences, and timestamps with free tools dedicated to dates and time.
19 tools available
4subcategories
Clear families that help you find the right operation quickly.
19embeddable widgets
The same tools ready to embed directly on your own website.
Why this category?
Why use dates & time tools?
A date is not just a number: months have different lengths, leap years matter, and timestamp formats quickly make manual calculations tedious. This category groups tools whose main purpose involves a date, a duration, or a representation of time.
Available tools already cover ages, date differences, and timestamps. The family is designed to grow into business-day calculations, adding or subtracting days, calendars, week numbers, time zones, and other time conversions without scattering them across Mathematics or Development.
Use cases
Compare two dates
Measure the exact difference between two dates or deadlines.
Calculate a duration
Get an age, interval, or duration expressed in several units.
Convert a timestamp
Switch between Unix timestamps and readable dates.
Browse by subcategory
All tools
Date calculations
Compare dates or add and subtract days.
Dates & time
Date Range Generator
Generate a list of dates between two endpoints.
100% localNew
Use this toolDates & time
Day of Week Calculator
Find the weekday for any date.
100% localNew
Use this toolDates & time
Day of Year Calculator
Find a date’s ordinal day within the year.
100% localNew
Use this toolDates & time
Recurring Dates Generator
Generate a daily, weekly, monthly or yearly series.
100% localNew
Use this toolDurations
Calculate ages, intervals, and durations.
Dates & time
Age calculator
Calculate an exact age from a date of birth and a reference date.
100% local
Use this toolDates & time
Date difference calculator
Calculate the exact difference between two dates in days, weeks, months, or years.
100% local
Use this toolDates & time
Beta
Add or Subtract Time from a Date
Add or subtract days, weeks, months or years from a date.
100% localNew
Use this toolDates & time
Beta
Business Days Calculator
Count business days between two dates, excluding Saturdays and Sundays.
100% localNew
Use this toolDates & time
Beta
Time Duration Calculator
Calculate the duration between a start time and an end time.
100% localNew
Use this toolDates & time
Beta
Duration Converter
Convert seconds, minutes, hours, days and weeks.
100% localNew
Use this toolDates & time
Beta
Days Until a Date Calculator
Calculate how many days remain until a date, or how many days have passed.
100% localNew
Use this toolDates & time
Beta
ISO Week Number Calculator
Find the ISO week number of a date and the start and end dates of that week.
100% localNew
Use this toolDates & time
Work Hours Calculator
Calculate worked hours after subtracting breaks.
100% localNew
Use this toolDates & time
Business Hours Calculator
Calculate business hours between two date-times.
100% localNew
Use this toolTimestamps
Convert Unix timestamps and readable dates.
Dates & time
Timestamp converter
Convert a Unix timestamp to a readable date or turn a date into a Unix timestamp.
100% local
Use this toolDates & time
Date Format Converter
Convert dates between ISO, day-first and month-first formats.
100% localNew
Use this toolDates & time
Relative Time Calculator
Express a difference as “3 days ago” or “in 2 hours”.
100% localNew
Use this toolCalendar & time zones
Work with calendars, weeks, and time zones.
Dates & time
Time Zone Converter
Convert a date and time between two time zones.
100% localNew
Use this toolDates & time
Meeting Time Planner
Find overlapping meeting times across two time zones.
100% localNew
Use this toolAll these tools are also available as widgets
Add tools from this category to WordPress, Webflow, Wix, or any HTML page with the same local processing.
Related resources
GuideBest practicesBeginner
Date and time calculations: a practical guide
Date differences, durations, business days, ISO weeks, recurrences and formats: choose the right date and time calculation.
7 September 20262 minRead
Frequently asked questions
Are time zones always considered?
It depends on the tool. Each page explains the rules applied to its calculation.
Can I calculate past and future dates?
Yes when the relevant tool accepts both kinds of dates.
Do calculations run locally?
Yes. Compatible tools perform calculations directly in your browser.