Calculate the number of days between two dates. Choose a start date and an end date to see the total number of days, weeks, weekdays and weekend days in the selected period.
How many days are between two dates?
The calculator above finds the difference between any two calendar dates.
It can show:
- Total days between the dates
- Total weeks
- Remaining days after complete weeks
- Weekdays
- Weekend days
- Approximate months
- Start and end weekdays
This can be useful for planning projects, trips, deadlines, contracts, anniversaries and other date-based events.
How to calculate days between dates
To calculate the difference:
- Select a start date.
- Select an end date.
- Choose whether the start and end dates should be included.
- Select Calculate difference.
The result appears immediately below the form.
Are the start and end dates included?
There are two common ways to count dates.
If you calculate the difference between January 1 and January 2 without including both dates, the dates are 1 day apart.
If both January 1 and January 2 are included in the count, the selected period contains 2 calendar days.
The calculator lets you choose whether to include the start date and end date.
Days vs calendar days
A calendar day means any day of the week.
Calendar days include:
- Monday
- Tuesday
- Wednesday
- Thursday
- Friday
- Saturday
- Sunday
If you need to exclude weekends and count only Monday through Friday, use the Business Days Calculator.
Weeks between two dates
Seven calendar days equal one week.
For example:
- 7 days = 1 week
- 14 days = 2 weeks
- 30 days = 4 weeks and 2 days
- 100 days = 14 weeks and 2 days
The calculator displays complete weeks together with any remaining days.
Weekdays between dates
The result also shows the number of weekdays in the selected date range.
Weekdays are:
- Monday
- Tuesday
- Wednesday
- Thursday
- Friday
Saturday and Sunday are counted separately as weekend days.
Public holidays are not excluded.
Weekend days between dates
Weekend days are Saturdays and Sundays.
This information can be useful when comparing calendar time with working time.
For example, a 30-day period may contain approximately 21 or 22 weekdays and 8 or 9 weekend days depending on where the period begins and ends.
Months between two dates
Months do not all contain the same number of days, so there is no fixed number of days in a month.
A month can contain:
- 28 days
- 29 days
- 30 days
- 31 days
The calculator therefore shows the exact number of calendar days as the primary result.
Date difference and daylight saving time
The calculator works with calendar dates rather than simply measuring elapsed hours.
This is important around daylight saving time changes, when a local day may contain 23 or 25 hours instead of exactly 24.
The number of calendar days between two dates remains consistent.
Common uses for a date difference calculator
A days-between-dates calculator can help with:
- Project planning
- Travel planning
- Delivery schedules
- Contract periods
- School terms
- Deadlines
- Event countdowns
- Subscription periods
- Anniversary calculations
- Historical date comparisons
Need to add or subtract days instead?
If you already know how many days, weeks, months or years you want to move from a specific date, use the Date Calculator.
For example, it can calculate:
- 30 days from a date
- 12 weeks from a date
- 6 months before a date
- 2 years from a date
Related date tools
You may also find these useful:
- Business Days Calculator
- Date Calculator
- Today’s Date
- Tomorrow’s Date
- Yesterday’s Date
- Current Week Number
- Calendar
Frequently asked questions
How do I calculate the number of days between two dates?
Choose the start and end dates in the calculator above. It will calculate the total number of days between them.
Are weekends included?
Yes. The total-days result includes Saturdays and Sundays. The calculator also shows weekdays and weekend days separately.
Can I exclude the start date?
Yes. Uncheck Include start date.
Can I exclude the end date?
Yes. Uncheck Include end date.
Does the calculator count business days?
It shows the number of Monday-to-Friday weekdays, but public holidays are not excluded. For a dedicated working-day calculation, use the Business Days Calculator.
Can I calculate dates in the past?
Yes. You can use any supported past or future dates.
Does daylight saving time affect the result?
No. The calculator compares calendar dates, so daylight saving time changes do not alter the calendar-day difference.
How many days are in a week?
There are seven calendar days in a week.
How many days are in a month?
Months contain 28, 29, 30 or 31 days, depending on the month and whether it is a leap year.