Date
Plan dates without calendar guesswork.
Count days, calculate deadlines, find ages, and handle business-day rules with clear assumptions.
A complete path
From question to useful next step.
- 01 · Define
Set the calendar boundaries
Choose inclusive or exclusive dates and state the calendar convention.
- 02 · Understand
Keep calendar logic visible
Month lengths, leap years, weekends, and holidays are not interchangeable.
- 03 · Plan
Turn the span into a decision
Use the result for deadlines, workdays, age, or a calendar view.
Start here
Common tasks
A focused way into the tools people reach for most often.
Date Difference Calculator
Calculate the exact difference between any two dates.
Business Days Calculator
Count working days between dates excluding weekends.
Age Calculator
Calculate your exact age in years, months, days, and more.
Complete collection
All date tools
Every published tool in this area, including the ones featured above. Each opens a working route.
Date Difference Calculator
Calculate the exact difference between any two dates.
Open tool →Date CalculatorsDays Between Dates
Count the number of days between two dates.
Open tool →Date CalculatorsAdd or Subtract Date
Add or subtract days, weeks, months, or years from a date.
Open tool →Date CalculatorsBusiness Days Calculator
Count working days between dates excluding weekends.
Open tool →Date CalculatorsAdd Business Days
Add working days to a date, skipping weekends.
Open tool →Date CalculatorsAge Calculator
Calculate your exact age in years, months, days, and more.
Open tool →Date CalculatorsWeek Number Calculator
Find the ISO week number for any date.
Open tool →Date CalculatorsDay of Week Calculator
Find which day of the week any date falls on.
Open tool →Date CalculatorsDay of Year Calculator
Find the day number of any date in the year.
Open tool →Date CalculatorsDays Until Calculator
Count days until a future date.
Open tool →Date CalculatorsDays From Today Calculator
Find the date a certain number of days from today.
Open tool →Date CalculatorsLeap Year Checker
Check if any year is a leap year.
Open tool →Connected work
Continue the workflow
Understand the details