Use this calculator to count down to any future date or see how many days have passed since a past date. The result updates in real time using the proleptic Gregorian calendar per ISO 8601.
💡 Did you know? The concept of "countdown" was popularized by the 1929 Fritz Lang film Frau im Mond ("Woman in the Moon"). Today, countdowns are used for New Year's Eve (the most-watched countdown worldwide), rocket launches, sporting events, and product launches.
Frequently Asked Questions
Christmas 2026 is December 25, 2026. Use our calculator above to find the exact number of days until Christmas, or any other future date. We update the count in real time.
Weeks = days ÷ 7. For example, 30 days until a date = 4.3 weeks. 60 days = 8.6 weeks. Our calculator shows weeks as a decimal for precision.
Months = days ÷ 30.44 (average month length). For 90 days, that's ~3 months. Note: months have varying lengths (28-31 days), so this is an approximation. For calendar-accurate months, our Date Calculator handles adding calendar months.
Yes. Our calculation uses the proleptic Gregorian calendar with standard leap year rules. If your target date is February 29, 2028, the count includes the leap day correctly.
Days-until calculations use calendar days (not clock time), so time zone does not affect the result. The date is the date wherever you are in the world.
Yes. Enter your birth date (or the next occurrence) and our calculator shows exactly how many days, weeks, and months until your birthday. Pair with our Age Calculator for a complete birthday toolkit.
Use your phone's calendar app or a service like Google Calendar to set reminders. Our calculator tells you how many days away the date is, so you can plan reminders (e.g. "30 days before", "1 week before").
After 2024, the next leap years are 2028, 2032, 2036, and 2040. A leap year has 366 days, so any countdown crossing Feb 29 needs to account for this.