Date Calculator | Days Between Dates and Add Time
Calculate days between dates, add or subtract years, months, and days, and find target dates for deadlines, billing, travel, and planning.
What the Date Calculator Finds
The date calculator can count days between two dates or add and subtract years, months, and days from a start date. It is useful for deadlines, billing periods, travel plans, and timelines.
Calendar Differences Can Be Tricky
Months have different lengths and leap years can change day counts. Review the total days and the year-month-day breakdown when exact timing matters.
When to Verify Dates
Use the result for planning, reminders, and estimates. Verify official deadlines, legal dates, medical schedules, and contract periods in the original system of record.
About This Tool
Date Calculator finds the number of days between two dates, calculates a future or past date by adding or subtracting days, and determines weekdays, week numbers, and working days while optionally excluding weekends and public holidays.
When to Use It
Use this when calculating a project deadline by adding business days, when determining how many days remain until an event, or when figuring out the date that falls 90 days after a contract is signed.
How to Use
- Select the calculation type: days between dates, or add/subtract from a date.
- Enter the start date and either the end date or the number of days to add.
- Choose whether to count calendar days or working days only.
- Click Calculate to see the result.
Frequently Asked Questions
Does it exclude weekends when counting working days?
Yes. The working days option counts only Monday through Friday and skips Saturday and Sunday.
Can I calculate a date 90 days from today?
Yes. Select the add/subtract mode, enter today's date, and add 90 days to see the resulting date.
Does it account for leap years?
Yes. Leap year days are included in date calculations automatically.