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A Date Calculator finds the time between two dates or gives you a new date after adding or removing time. It can show days, weeks, months, years, and business days, so you can plan tasks with less manual counting. It also helps check important deadlines.
Our Date Calculator quickly calculates the duration between two dates. Enter your dates, view the result in useful time units, and copy the answer for planning, deadlines, schedules, or records.
Enter the start and end dates into the calculator.
Get the duration in years, months, and days.
View the total days, weeks, hours, and months.
Copy the calculated duration for future use.
Enter the start and end dates into the calculator.
Get the duration in years, months, and days.
View the total days, weeks, hours, and months.
Copy the calculated duration for future use.
A Date Calculator measures date differences, finds future or past dates, and counts calendar or business days for planning.
Find the exact number of calendar days between a start date and an end date. You can include the end date when your task requires inclusive counting.
Convert the time between two dates into weeks. The calculator can show full weeks and remaining days for a clearer date duration.
Find the number of months between two dates. Month lengths vary, so the calculator handles each calendar month correctly for your result.
See a date duration as years, months, and days. This format helps explain long periods such as age, contracts, service time, or project length.
Find the date that comes after a specific number of days. This helps you plan deadlines, events, milestones, appointments, and future tasks.
Find the date that comes before a specific number of days. Use it to plan notice periods, preparation dates, appointments, and earlier deadlines.
Calculate business days between two dates when weekends should not count. This helps with work schedules, payroll, contracts, dates, and deadlines.
The Gregorian calendar guides modern date calculations. Its rules explain month lengths, leap years, and why some years have 365 days while others have 366 days. These rules support accurate date and holiday planning.
Holidays can change working day totals. U.S. federal holidays follow dates set by federal law, with observed dates used when holidays fall on weekends. Check the holiday list when planning work deadlines.
Year | Observed Date | Federal Holiday |
|---|---|---|
2026 | January 1 | New Year's Day |
2026 | January 19 | Birthday of Martin Luther King, Jr. |
2026 | February 16 | Washington's Birthday |
2026 | May 25 | Memorial Day |
2026 | June 19 | Juneteenth National Independence Day |
2026 | July 3 | Independence Day |
2026 | September 7 | Labor Day |
2026 | October 12 | Columbus Day |
2026 | November 11 | Veterans Day |
2026 | November 26 | Thanksgiving Day |
2026 | December 25 | Christmas Day |
2027 | January 1 | New Year's Day |
2027 | January 18 | Birthday of Martin Luther King, Jr. |
2027 | February 15 | Washington's Birthday |
2027 | May 31 | Memorial Day |
2027 | June 18 | Juneteenth National Independence Day |
2027 | July 5 | Independence Day |
2027 | September 6 | Labor Day |
2027 | October 11 | Columbus Day |
2027 | November 11 | Veterans Day |
2027 | November 25 | Thanksgiving Day |
2027 | December 24 | Christmas Day |
The U.S. Office of Personnel Management lists these dates for federal employee holiday schedules. Weekend holidays receive an observed weekday for most federal employees.
Find practical calculators for common tasks, measurements, planning, and personal needs.
These answers cover Date Calculator questions about date differences, adding or subtracting days, leap years, weeks, and months.