How this calculator works
The countdown is the number of calendar-day boundaries from the count date to the wedding; the count date is not itself counted. Whole months use the calendar convention that a month is complete when the same day number is reached, with the last day of a shorter month standing in when there is no such day. The planning table counts back by calendar months from the wedding date, so the twelve-month date is the same day of the month one year earlier and the one-month date keeps the wedding day where the earlier month has it. The one-week date is seven calendar days before.
Formula
days remaining = O(wedding date) - O(count date). weeks = floor(days / 7) with the remainder in days. Whole months are the largest m for which the count date plus m months is not after the wedding date, clamped to the last day of a short month. A planning date is the wedding date minus the stated number of calendar months, or minus seven days for the one-week mark.
Worked example
From 2026-11-01 to a wedding on 2027-09-18 is 321 days, or 45 weeks and 6 days. That is 10 whole months, or 0 years, 10 months and 17 days, and the day falls on a Saturday. The six-month planning date is 2027-03-18 and the one-week date is 2027-09-11.
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Frequently asked questions
Does the countdown include the wedding day?
No. The count is the number of day boundaries before the day, so the answer is zero on the wedding date. Add one if you want the wedding day itself counted as a remaining day.
Why are the planning dates calendar dates rather than fixed day counts?
Wedding plans are usually described in months, such as six months before, and calendar months vary in length. Stepping by months keeps each milestone on the same day of the month, which matches how contracts and vendors usually speak.
What if the wedding date has passed?
A wedding date before the count date is reported as an error, not a negative countdown. Change the count date to a day before the wedding to view the interval.
Can the milestone dates fall in the past?
Yes. If the count date is already closer than twelve months, some planning dates are behind you. The date is still shown with a negative days-from-count value so you can see which checkpoints have passed.