Date Difference Calculator
Find the interval between two dates in days and weeks.
Date calculators
Work out the distance between two dates, or move a date forward and back. Count the days between two moments, find an age, add a span of years, months and days, or total the working days between two dates. Results are calculated in your browser and each page states the method it uses.
12 tools in this part of the catalogue.
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.