Weeks Between Two Dates Calculator

Decimal weeks divide total elapsed days by 7. For example, 10 days is 1 full week and 3 days, or 10 / 7 = 1.43 decimal weeks.

The engine calculates the continuous elapsed span between midnight of the start date and midnight of the end date.

Calculate exact completed full weeks, remaining days, total calendar days, and fractional decimal weeks between any two calendar dates.

Interval Span Calculator

Start Date:

End Date:

Full Weeks

Remaining Days

Decimal Weeks

-- total calendar days

Formula for Weeks Between Dates

The mathematical formula calculates the absolute calendar difference between two epoch timestamps in milliseconds:

Total Days = |Timestamp_End − Timestamp_Start| ÷ 86,400,000

Full Weeks = Math.floor(Total Days ÷ 7)

Remaining Days = Total Days % 7

Decimal Weeks = Total Days ÷ 7

Common Questions

How do decimal weeks work in project timelines? +

Does this calculation count inclusive or exclusive of the end date? +