Pick the day you first met and a reference date, and the tool shows which day you are on, how many 100-day marks have already passed, and the dates and weekdays of both the next 100-day mark and the upcoming yearly anniversary. You can table a chosen number of future 100-day marks, so distant dates such as day 300 or day 500 can be noted well in advance.
Whether the day you met counts as day 1 or the day after does is a matter of custom, so both options are offered and the one you pick is printed with the result. Dates are worked out by adding calendar components directly, so the figures do not shift with the reader time zone, and spans crossing a leap day are counted in real days. Written as of October 2026.
Counting down to a recurring date from only a month and day is not covered. No compatibility reading or judgment about how long a relationship will last is offered, and when the starting date is February 29 the yearly anniversary is placed on March 1 in common years.
Frequently Asked Questions
Neither rule is fixed by law, so both are in use. Counting the day you met as day 1 puts day 100 at 99 days after that date, while counting the following day as day 1 puts it at 100 days. Whichever you pick is printed with the result.
Common years have no February 29, so the yearly anniversary falls on March 1 instead. If you prefer February 28, read the anniversary date one day earlier.
Counting down to a recurring date from only a month and day is not covered here. This tool counts from the day you first met: which day you are on now and when each 100-day mark falls.