Professional Date Calculations, Instantly
Lightning-fast date arithmetic for professionals, planners, and anyone who needs reliable date math. 100% client-side processing—your dates never leave your browser.
For long-range planning, pair DateMath Pro with to map milestones, and lean on when you need printable schedules to share with your team.
Days Between Dates
Calculate the exact number of days between two dates, including business days
Date Calculator
Add or subtract days, weeks, months, or years from any date
Business Days
Calculate working days excluding weekends and federal holidays
Time Duration
Calculate precise duration between date/times with hour/minute precision
Days Until/Since
Count days to future events or track time since past dates
Recurring Dates
Generate series of recurring dates (weekly, monthly, yearly)
Date Range Picker
Bulk date calculations across entire date ranges with filtering
Calendar View
Visualize calculated dates on an interactive calendar
All Calculators
View the complete list of available date calculators
Why DateMath Pro?
Lightning Fast
Instant calculations with real-time updates. No waiting, no delays.
100% Accurate
Professional-grade calculations including business days and holidays.
Private & Secure
100% client-side processing. Your dates never leave your browser.
No Account Needed
Start calculating immediately. No signup, no login, no hassle.
All calculations happen in your browser. We never see, store, or transmit your dates.
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