Days between dates
Add or subtract days
Results
Years
0
Months
1
Days
0
Total days
31
Business days
23
Weekdays
23
Weekend days
8
Weeks
4w 3d
Adjusted date
2024-01-31
Day breakdown
| Type | Count |
|---|---|
| Total days | 31 |
| Weekdays | 23 |
| Weekend days | 8 |
| Business days | 23 |
Weekdays exclude Saturday and Sunday.
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How this calculator works
Finds calendar and business-day spans between dates, plus adds or subtracts a day offset from a base date. Dates are normalized to UTC to reduce timezone drift.
Quick guide
Jump straight to the section you need, then return to the calculator.
Inputs
- Start date for the date range
- End date for the date range
- Include end date toggle
- Delta days to add or subtract
Outputs
- Years, months, and days breakdown
- Total days and business days
- Weeks and remaining days
- Adjusted date after applying delta
Assumptions
- Dates are interpreted at UTC midnight
- Delta days can be positive or negative
Tips
- Use the same timezone when comparing dates
- Negative delta values subtract days
Formula guide
Use these formulas to audit the output or explain it to someone else.
2 formulas
Usage examples
Review a ready-made scenario, copy it, then tweak inputs to match your case.
Example
Days between dates
Inputs
- Start 2024-01-01
- End 2024-02-01
Outputs
- Days between equals 31
- Use for elapsed time checks
Calendar months have different lengths.
Example
Add days
Inputs
- Base date 2024-01-01
- Delta +45 days
Outputs
- Adjusted date 2024-02-15
- Useful for scheduling follow-ups
Negative deltas move the date backward.
Date offsets from 2024-01-01
| Delta days | Result date |
|---|---|
| +7 | 2024-01-08 |
| +30 | 2024-01-31 |
| -15 | 2023-12-17 |
Offsets are shown using UTC midnight normalization.
Common ranges
Focus point
7 days
7
Position
#1 of 3
Original order
Share of total
5.51%
Total: 127
Use these as quick mental anchors for planning.
References
- ISO 8601 date format
FAQ
Common questions
What does the Date Calculator do?
Finds calendar and business-day spans between dates, plus adds or subtracts a day offset from a base date. Dates are normalized to UTC to reduce timezone drift. It is part of our other toolkit.
What inputs do I need?
Typical inputs include Start date for the date range, End date for the date range, Include end date toggle.
How are the results calculated?
We follow the formulas and assumptions outlined in the "How this calculator works" section. You will see outputs like Years, months, and days breakdown, Total days and business days, Weeks and remaining days.
Can I share or download the results?
Use the Copy link or Print buttons to share your results. If a table or chart appears, you can download the data as CSV.
Is my data stored?
No. Calculations run in your browser and we do not store your inputs.
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