Date duration calculator
Created by
Eon CalculatorThe date duration calculator is a simple tool developed to calculate the total time between two dates. This calculator provides instant and accurate results, especially when finding how many days, weeks, months, or years.
What is the date duration
Date duration refers to the total time that has passed between two different dates. The duration is usually measured in years, months, weeks, and days. For example, If you need to know how much time has passed between February 7, 2025, and March 15, 2022, the result would be like this: Total Days: 1062, Total Weeks: 151.71, Total Months: 34.89, Total Years: 2.91, Entire Duration: 2 years, 10 months, and 27 days.
How to calculate manually
If you want to calculate the duration between two dates without using a calculator, follow these simple steps:
Step 1: Write the date in YYYY-MM-MM (Year-Month-Day) format. For example, if you calculate the duration between March 18, 2021, and September 5, 2023, write it as 2023-09-05 – 2021-03-18.
Step 2:Now subtract the days; if the day of the end date is greater than the start date, subtract; if the end date is a smaller value, borrow days from the months column.
Step 3: Next, subtract the months; subtract the values if the month’s end date is greater than the start date. If it is smaller, borrow 12 months from the year; for example, September (9) – March (3) = 6 months.
Step 4: Finally, subtract the years since the end year exceeds the start year. Subtract the value; 2023−2021=2 years. This means the total difference between the two dates is 2 years, 5 months, and 18 days.
| Start Date | End Date | Total Days | Workdays | Weekends | Holidays |
|---|---|---|---|---|---|
2025-01-01 | 2025-01-31 | 30 days | 21 days | 9 days | 1 day |
2025-01-01 | 2025-03-31 | 89 days | 64 days | 25 days | 3 days |
2025-06-01 | 2025-07-31 | 60 days | 43 days | 17 days | 1 day |
2025-11-24 | 2025-11-28 | 5 days | 4 days | 1 day | 1 day |
2025-12-20 | 2025-12-31 | 11 days | 6 days | 3 days | 2 days |
2025-01-01 | 2025-04-15 | 105 days | 76 days | 29 days | 4 days |
2025-09-01 | 2025-09-07 | 7 days | 5 days | 2 days | 1 day |
2025-05-23 | 2025-05-26 | 4 days | 3 days | 1 day | 1 day |
Table 1 shows date duration to most common U.S. schedules like Tax Season, Summer Break , Thanksgiving Week , Year-End Holidays, Labour Day Weekend , and Memorial Day Weekend .
How to use this calculator
Step 1: Enter the start date; this is the date on which the duration begins. You can type it manually or select the date using the calendar. We used an MM/DD/YYYY (Month/Day/Year) format for date input.
Step 2: Now enter the end date (this is where the duration stops). You can enter dates manually or select them from the calendar for the start time. We also used the same format for easy understanding.
Step 3: Click the calculate button, and the calculator will instantly display the result. You will specify years, months, weeks, days, and all these data together.
Why do you need this tool
Legal and Financial: Calculate loan interest periods, mortgage payments, contract durations, agreement deadlines, tax filings, and investment or insurance maturity dates.
Health and Fitness: Track the recovery time of injuries or surgeries, pregnancy duration, fitness/weight loss process, and medication schedules.
Project Management: To estimate the timeline for assignments, projects, business plans, construction projects, software development cycles, and product production schedules.
Event Planning: To Schedule weddings, vacations, work deadlines, conference dates, birthday parties, and other special occasions with precise time tracking.
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