Measure the span between two dates in days, weeks, calendar months, and business days.
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Weeks
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Full months
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Business days
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This tool measures how far apart two dates are and expresses that gap four ways at once. Days is the exact count, leap years included. Weeks is that count divided by seven. Full months counts only completed calendar months, so a gap that ends before the same day-of-month it started on does not round up. Business days strips out weekends and US federal holidays, which is the figure that matters for deadlines and delivery windows.
From January 1, 2024 to March 15, 2024 is 74 days — about 10.6 weeks and 2 full calendar months. The two months come from January and February being complete; the leftover 14 days of March do not add a third.
The business-days figure is always lower than the raw day count because it removes every Saturday, Sunday, and observed federal holiday in the range — the number a contract or shipping estimate actually runs on.
Why is "full months" sometimes lower than I expect?
It counts only completed months. From the 1st to the 15th of two months later is 2 full months, not 2.5 — the partial third month is reported through the day count instead of being rounded.
How is the weeks figure derived?
It is the day count divided by seven, rounded to one decimal place. It is a convenience view of the same span, not a separate calendar calculation.
Which holidays are excluded from business days?
The eleven US federal holidays, each applied on its observed date — a holiday landing on a Saturday is observed the Friday before, and one on a Sunday the Monday after.
Does the order of the two dates matter?
Put the earlier date first for a positive count. The span itself is the same magnitude either way; this tool reports the forward count from start to end.