Online Date Calculator
Effortlessly perform any date calculation. Find the exact time between two dates, add or subtract from a date, and find the day of the week for any event.
Calculate Time Between Dates
Add or Subtract From a Date
Find Day of the Week
Fast, Free, Private Online Date Calculator
Do quick date math in seconds. Find the exact time between two dates, add or subtract days, weeks, months, or years, and see the day of the week for any date. Free forever, fast, and 100% private everything runs locally in your browser.
Why people love this date calculator
📏 Exact breakdown
See differences in years, months, and days plus total days for quick planning.
📆 Calendar-accurate
Handles leap years and month lengths correctly for trustworthy results.
🕒 Timezone-safe
Calculations use UTC to avoid Daylight Saving surprises.
🔒 Private by design
Your data stays on your device. No uploads, no tracking ever.
⚡ Fast & free forever
Unlimited use. No signups, no paywalls, no limits.
📱 Mobile friendly
Works great on Chrome, Edge, Firefox, and Safari across desktop and mobile.
Popular uses worldwide
Project planning & deadlines
Calculate sprints, milestones, and go-live dates with precision.
Events & marketing
Work back from an event to set production and promotion timelines.
Travel, visa & passport
Check stay durations and application windows for trips abroad.
School & academic calendars
Map terms, exam dates, and assignment due dates.
Payroll & finance cycles
Plan pay periods, invoice due dates, and billing cycles.
Legal & compliance
Track filing deadlines, cooling-off periods, and contract dates.
Healthcare & appointments
Schedule follow-ups and calculate intervals between visits.
Sports & competitions
Plan seasons, training blocks, and tournament schedules.
Shipping & returns
Estimate delivery windows and return-by dates for e commerce.
Built for users in the USA, UK, Canada, Australia, India, and across the EU works worldwide.
What this Date Calculator does
Use this free, fast, and private date calculator to do date math in seconds. Find the exact time between two dates, add or subtract days, weeks, months, or years, and instantly see the day of the week for any date. It’s 100% confidential everything runs locally in your browser.
- Days between dates (accurate with leap years)
- Add/subtract days, weeks, months, or years
- Find the weekday for any date
How we calculate results
We use calendar-aware arithmetic and UTC time to avoid daylight saving surprises. Month and year differences respect real calendar boundaries.
Examples
- How many days between Jan 1 and Jul 1 this year?
- Add 90 days to a project start date to find the deadline.
- What day of the week is 2026-02-14?
Global availability (GEO)
Optimized for users in the USA, UK, Canada, Australia, India, and across the EU. Popular searches include “date difference calculator”, “days between dates”, “add days to date”, and “day of week calculator”. Works with English date formats worldwide.
Frequently Asked Questions
Is it private and secure?
Yes. All calculations happen locally in your browser. Your dates are never sent to our servers.
Which date formats can I use?
We use your device’s native date picker, supporting common formats like MM/DD/YYYY (USA) and DD/MM/YYYY (UK/India).
Do you handle leap years and month lengths?
Yes. The calculator accounts for leap years and varying month lengths for accurate results.
How are days counted exclusive or inclusive?
We count calendar days between the start and end date (exclusive of the start date). If you need inclusive results, add one day to the total.
What time zone do you use?
Calculations use UTC to avoid Daylight Saving Time issues and keep results consistent globally.
Can I add or subtract weeks, months, or years?
Yes. Choose Add or Subtract, enter an amount, and pick days, weeks, months, or years to get the new date instantly.
Does adding months handle end of month dates?
We use standard calendar roll over. For dates like Jan 31, results follow real calendar rules. If you need “end of month” anchoring, adjust accordingly.
Is it really free and unlimited?
Yes—lifetime free, fast, and unlimited. No signups, no paywalls, no watermarks.
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