Date Calculator
Calculated in your browser — we never store your dataVerified formulas with automated testing
Quick Reference
7
1 week
30
~1 month
90
~3 months
365
1 year
Sources & Methodology
Formula:
Days Between = End Date - Start DateCalendar day calculation
Source: Gregorian calendar system
How to Use the Date Calculator
Calculate the number of days between two dates or find a date by adding or subtracting days from a starting date. Perfect for planning events, tracking deadlines, or calculating age.
Two Calculation Modes
- Days Between Dates: Find the exact number of days, weeks, months, and years between any two dates
- Add/Subtract Days: Calculate a future or past date by adding or subtracting a specific number of days
Common Uses
- Calculate days until an event (wedding, vacation, deadline)
- Determine how long since a past event
- Find payment due dates
- Calculate project timelines
- Track pregnancy milestones
Quick Reference
Common time periods: 7 days = 1 week, 30 days ≈ 1 month, 90 days ≈ 3 months (quarter), 365 days = 1 year (366 in leap years).
Related Time & Planning Calculators
Plan loan payoffs using our amortization calculator to see payment schedules by date. Track retirement timeline based on your target date. Calculate grade deadlines for students. See how investments grow over specific time periods.
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