Date Difference Calculator

Subtract the earlier date from the later date. Our calculator handles all the complexity including leap years and month lengths. Simply enter both dates and get the exact difference in years, months, days and total days.

Enter today's date as the start date and December 25, 2026 as the end date in our date calculator. It will show exactly how many days, weeks and months remain until Christmas.

Use our Age Calculator for this. Enter the date of birth as the start date and today as the end date to find someone's exact age in years, months and days.

A business day calculator counts only working days (Monday to Friday), excluding weekends and holidays. Our calculator counts all calendar days — for business days, subtract approximately 2/7 from the total.

Divide the number of days between the two dates by 7 to get the number of weeks. Our date calculator shows both the exact day count and the equivalent in weeks automatically.