Event date facts
The original event date keeps its own factual calendar profile, separate from the elapsed-time calculations.
Event date—
Weekday—
ISO week—
Day of year—
Quarter—
Year type—
OneFreePlace · Tool #120
Measure what has passed—and see what milestone comes next.
Count exact days since an event, inspect real calendar years/months/days, weekdays and weekends, completed anniversaries, anniversary progress, milestone history and optional active days after pauses. Add a live local elapsed clock, save multiple events privately and export the next milestones to your calendar.
✓ Exact date-only math✓ Anniversary intelligence
✓ Milestone history + next target✓ Optional pause tracking
✓ Private saved events
Days Since Calculator
Elapsed · anniversaries · pauses · milestones · export
Elapsed-time setup
What happened, and when?
Counting conventionStandard: event date is day zero.
The live clock uses this device’s local time zone and browser daylight-saving rules. It is available when “Count through” is today.
Start | end | optional label. Both pause dates are included. Overlapping ranges are merged, and only dates inside the counted span are subtracted.
Anniversary + milestone settingsUseful history without changing the primary count.
Whole positive values. Reached and upcoming milestones are shown together. Up to 40 values.
Days since
Calendar-day exact—
days since
Choose an event date.
Weeks + days—exact from elapsed calendar days
Calendar span—real years, months and days
Weekdays—Monday–Friday only; no holidays
Weekend days—Saturday + Sunday
Completed anniversaries—full annual recurrences reached
Active days—same as elapsed unless pauses enabled
Progress to next anniversary—
—
Milestone history—
Saved events
Saved only in this browser. Each saved event recalculates itself against today when the list is opened.
Why this goes beyond “today minus date”
Exact date-only engineCalendar-day counting is isolated from daylight-saving shifts and local clock changes.
Anniversary intelligenceSee completed anniversaries, last and next anniversary dates, and precise progress through the current anniversary year.
Pause-aware trackingOptionally subtract merged pause periods from an “active days” metric without rewriting the raw elapsed count.
Milestone historySee reached dates, the next configured milestone and an automatically suggested round-number milestone.
Live elapsed clockWhen counting through today, add an event time for real local elapsed days/hours/minutes/seconds.
Save + exportKeep trackers privately in-browser and export the next anniversary and milestones as all-day ICS events.
Counting conventions, made explicit
Standard: the event date is day zero. The following day is 1 day since the event. Include both dates: counts every date in the span, so event day through the next day is 2 calendar dates.
Weekday counts mean Monday–Friday only and do not imply working days or public-holiday rules. The optional pause tracker is a separate user-defined metric.
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Date-only and live elapsed time answer different questions.The main result counts calendar days. The optional live clock uses actual local elapsed time from the event time to now and therefore follows your browser’s time zone and daylight-saving rules.