Date Difference Calculator
Find the number of days, weeks, or months between two dates.
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How It Works
Calculates days between two dates by converting to day counts and subtracting. Also shows weeks and approximate months.
Formula
Difference = End - StartQuick Reference
Common calculations — results you can verify instantly.
Jan 1 to Dec 31
364 days
52 weeks exactly
Mar 15 to Jun 15
92 days
3 months
Same day different year
Exactly 365 days
1 year
Tips & Shortcuts
Used for project timelines and contract durations.
Account for leap years in multi-year calculations.
Common Mistakes
Confusing calendar with business days
Calendar includes weekends. Business days exclude them.
Adding months without accounting for variable month lengths
Use exact day calculation for precision.
Frequently Asked Questions
364 days (365 in leap year).
Total days minus weekends times 2 then subtract holidays.
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