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Date Diff

Pick start & end
Start
End
Options
General
Business days
Holidays (one per line, YYYY-MM-DD)

About Date Diff

Compare two local dates/times or add a duration to a base date. See totals (ms→weeks), calendar-aware breakdown (years/months/days…), and business-day counts excluding weekends and your custom holidays.

  • Include time switches between date-only and full datetime math for Difference.
  • Count end day adds the end date in day/business counts (useful for inclusive ranges).
  • Add/Subtract applies years/months first (safe month carry), then weeks→seconds.