Guide / 01
When to use it
Use it to measure total calendar days between a project start and end and express that span approximately in weeks or average-length months.
TIME / 026
Date Difference Calculator
Measure days between two dates, plus weeks and approximate average months.
Private workspaceYour input stays on this device. HaloBench tools run in your browser whenever possible.
30days
4.29weeks
0.99Approx. months
Guide / 02
Quick guide
- Select the start and end dates.
- Read the absolute day count, weeks obtained by dividing by seven, and approximate months based on 30.4375 days.
- For a stay or contract that counts both boundary dates, verify whether your rule requires adding one day.
Check
Validate the result
Choose 2026-01-01 and 2026-01-08; the expected output is 7 days and 1.00 week.
Limits
Know the limits
The result is absolute regardless of date order and contains no time-of-day component. Months are an average-day approximation, not a calendar years-months-days decomposition.
Reference
Input and output example
Use the same units and settings when comparing your result with this example.
- Example input
2026-08-08 → 2026-09-07- Result and interpretation
30 days · 4.29 weeks · approximately 0.99 months Months use an average of 30.4375 days, not complete calendar months.
FAQ
Frequently asked
Why is January 1 to January 2 shown as one day?
There are 24 hours between the two midnights. A business rule that counts both named dates as occupied calendar days would add one to this difference.
Does my data leave this device?
No. This tool is designed to process its working data in your browser. Advertising may load separately, but your tool input is never sent with it.