Wedding Countdown Calculator — Days Until Your Big Day
Enter your wedding date and instantly see how many days, weeks and months remain until the big day — or how long ago the wedding was if the date has already passed.
June 15, 2027
How does this calculator work?
Days to wedding = wedding date − today (exact, millisecond-precise, leap-year-aware). Weeks = days ÷ 7; months ≈ days ÷ 30.44; years ≈ days ÷ 365.25. Enter year, month and day for the countdown; if the date has passed it shows days since the wedding for anniversary tracking.
Formula
How this is calculated
The calculator finds the number of days between today's date and your entered wedding date by converting both to milliseconds since the Unix epoch and dividing the difference by 86,400,000 (milliseconds in one day), then rounding to the nearest whole day. This approach fully accounts for leap years and daylight-saving time transitions because the JavaScript Date object handles them internally.
Weeks are calculated by dividing total days by 7 (exact). Months use the average Gregorian month of 365.25 ÷ 12 ≈ 30.4375 days, which is correct on average but not tied to any specific calendar month. Years similarly use the mean Julian year of 365.25 days. Both approximate figures are shown for planning convenience alongside the exact day count.
If the date has already passed, the calculator shows how many days, weeks and months ago the wedding was — making it equally useful as an anniversary tracker. The timeline bar fills toward "today" as the wedding approaches, showing the countdown as a fraction of a one-year window.
Frequently asked questions
Yes. The exact day count uses millisecond differences between JavaScript Date objects, which fully account for leap years. The approximate months and years use the mean calendar lengths (30.4375 days/month, 365.25 days/year), which are averages rather than exact calendar-month counts.
The calculator re-labels the result as "Days since the wedding" and shows the elapsed time — you can use it as a wedding anniversary counter just as easily as a countdown.
Absolutely. The calculator works for any future or past date — birthdays, graduations, contract end dates and so on. Just enter the target year, month and day; the wedding label is purely cosmetic.
Also known as
TG we-Calculate Editorial Team. (2026). Wedding Countdown Calculator — Days Until Your Big Day [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/wedding-countdown-calculator
TG we-Calculate Editorial Team. "Wedding Countdown Calculator — Days Until Your Big Day." TG we-Calculate. 2026. https://we-calculate.com/calculator/wedding-countdown-calculator.
TG we-Calculate Editorial Team, "Wedding Countdown Calculator — Days Until Your Big Day," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/wedding-countdown-calculator
@misc{wecalculate_wedding_countdown_calculator, title = {Wedding Countdown Calculator — Days Until Your Big Day}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/wedding-countdown-calculator}}, year = {2026}, note = {TG we-Calculate} }
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