Days Calculator
Count the days between two dates, add or subtract days from any date, or find what date falls a certain number of days from today.
Days Between Dates
Calculate calendar days or Monday–Friday weekdays, with an explicit choice for counting both endpoints.
Add or Subtract Days
Pick a date and add or subtract a number of days to find the resulting date.
Days from Today
Enter a positive or negative number of days and instantly see the resulting future or past date.
Use positive numbers for future dates and negative numbers for past dates.
Date calculated from your current local date
Enter a number of calendar days to see the exact result and the matching weekday.
Quick Date Calculations
Popular day-from-today calculations at a glance.
14 Days
Uses your current local date
15 Days
Uses your current local date
21 Days
Uses your current local date
28 Days
Uses your current local date
30 Days
Uses your current local date
45 Days
Uses your current local date
60 Days
Uses your current local date
75 Days
Uses your current local date
90 Days
Uses your current local date
100 Days
Uses your current local date
120 Days
Uses your current local date
180 Days
Uses your current local date
These shortcuts use your device’s local date. If you are planning for someone in another time zone, check which date it is there before counting.
How to choose the right day count
A date range can describe elapsed days, dates on a calendar, or working days. First decide what you need to measure. A Monday check-in and Friday check-out describe four nights. An event running Monday through Friday covers five dates. Neither answer is a rounding error: they count different things.
| What you need | Setting | Result |
|---|---|---|
| Elapsed calendar days | Leave both boxes unchecked | 6 days |
| Every date in the period | Include both endpoints | 7 dates |
| Monday–Friday dates after the start | Count Monday–Friday only; do not include both endpoints | 4 weekdays |
For the same range, the standard US federal calendar gives three working days after the start: July 3 is an observed holiday. Use the business days calculator to remove observed holidays, enter company closures, select a different workweek, or audit each counted date. The weekday checkbox on this page removes Saturdays and Sundays only.
What does “include both dates” change?
With ordinary calendar days, counting both endpoints adds one. July 2 to July 8 is six days apart, or seven dates when you count July 2 itself. A range with the same date at both ends gives zero days apart, or one included date.
In weekday mode, the earlier date is excluded by default and the later date is included if it is Monday–Friday. Including both dates adds the earlier date only if that date is a weekday. A Saturday-to-Sunday range therefore contains zero weekdays with either setting. If you enter the dates in reverse order, this tool reports the same non-negative count and states that the end is before the start.
Thirty days is not always one month
“Add 30 days” advances exactly 30 calendar dates. “Add one month” follows a different rule, especially when the destination month has fewer days. From January 31, 2026, adding 30 days gives March 2. Moving to the last day of the following month gives February 28. Use the unit specified in your plan; this calculator’s add/subtract tool uses days.
For a simple timeline, start dates are day zero: one day after July 2 is July 3. Adding zero returns the same date. The “Days from Today” tool follows the same rule using your device’s current local date.
Calendar days and elapsed hours can disagree
A clock change can shorten or lengthen a local day. Crossing two dates on a calendar still advances two dates even if the elapsed hours are not 48. This calculator compares calendar dates, so daylight saving transitions do not create fractional days or shift the answer.
If you need “exactly 48 hours from 3 p.m.,” you also need the time and time zone. Use the time zone converter to check the relevant local times. For a deadline stated only as a date, confirm the receiving organization’s cutoff and counting convention before relying on a day count.
Common Date-Counting Mistakes
Calendar days vs business days
Calendar mode includes every date. Weekday mode excludes Saturday and Sunday only—it does not assume which country’s holidays or observed dates apply. For legal, payroll, or contractual deadlines, verify the governing rule.
Inclusive vs exclusive counting
Date ranges can be counted two ways. A hotel stay from Monday to Friday is usually 4 nights, but an event that runs Monday through Friday may be described as 5 calendar days. Decide whether the start date itself counts.
Time zones near midnight
“Today” can differ between two places at the same moment. For travel, remote teams, or international deadlines, pair this page with the time zone converter.
Week numbers and reporting periods
If your deadline is described by week number instead of date, use the week number calculator to confirm the Monday-to-Sunday range before counting days.