Date Difference Calculator
Find the interval between two dates in days and weeks.
Date and Time tools
Answer date and time questions quickly. Measure the gap between two dates, add or subtract days, count working days, find an ISO week number, or convert a time between zones and a Unix timestamp. Time zone results account for daylight saving where the zone uses it.
27 tools in this part of the catalogue.
Tools to start with
Age Calculator
Calculate an exact age on a chosen date, with the next birthday.
Add or Subtract Dates
Move a date forward or back by whole years, months, weeks and days.
Date calculators12 tools
Date Difference Calculator
Find the interval between two dates in days and weeks.
Age Calculator
Calculate an exact age on a chosen date, with the next birthday.
Add or Subtract Dates
Move a date forward or back by whole years, months, weeks and days.
Business Day Calculator
Count workdays in a date range, or move a date by workdays.
Duration Calculator
Add or subtract elapsed time in hours and minutes.
Hours Worked Calculator
Add up clock-in and clock-out times and subtract breaks.
Day of Year Calculator
Convert calendar dates and ordinal day numbers.
Recurring Date Generator
List recurring dates with a short-month rule.
Deadline Backplanner
Plan dependent tasks backward from a deadline.
Shift Roster Builder
Check entered shifts and worker overlaps.
CSV to Calendar File
Turn event rows into an ICS file.
Merge and Deduplicate Calendars
Merge simple ICS event files.
More Date and Time tools
Time Zone Converter
Convert one local time into another named time zone.
Unix Timestamp Converter
Convert Unix timestamps and inspect ISO dates and offsets.
ISO Week Number Calculator
Find the ISO week-year, week number and weekday for a date.
Online Timer
Count down from a time you set, with pause and a finish sound.
Stopwatch
Time an activity with start, pause and lap controls.
Countdown to a Date
Count down to a date and time you choose.
Pomodoro Timer
Run focus and break sessions in turn with start and pause.
Journey Arrival Time Calculator
Find local arrival time across named time zones.
Meeting Time Planner
Find common working times across zones.
Daylight Saving Transition Explorer
Inspect a zone’s yearly clock changes.
Interval Timer
Run repeating named timer intervals.
Printable Calendar Generator
Create a printable calendar with your dates.
Calendar Event File Generator
Create an ICS event file from your details.
Calendar File Viewer
Inspect local ICS event details.
Calendar Conflict Checker
Find overlaps in finite local calendars.