Weeks Calculator
Calculate the elapsed number of days and weeks between two dates.
Formula and assumptions
Elapsed duration excludes the end date as an additional inclusive day; daylight-saving changes do not affect UTC date arithmetic.
Results depend on the inputs and assumptions shown. Check units and independently verify important decisions.
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Frequently asked questions
How are weeks between dates calculated?
The calculator finds the elapsed day difference between the dates and divides by seven. The result may include fractional weeks and full completed weeks.
Is the end date included?
Date-difference tools commonly calculate elapsed time by subtracting the start date from the end date, which does not count both endpoints as full days. Check whether your use case needs inclusive counting.
Can I calculate weeks of pregnancy with this?
This is a general date-difference calculation, not a pregnancy dating tool. Pregnancy dating should use the appropriate clinical method and healthcare guidance.