Create a simple countdown from a starting date to any target date and see the result in days and weeks.
Calendar-day differences, business-day counting, days-until questions and date arithmetic.
The starting date defaults to today. Enter a target date to see the number of days, full weeks plus remaining days, and total decimal weeks. Past target dates are labeled as days since the target.
Standard countdowns measure the date difference and do not count the starting date as a full day. Choose inclusive counting when a rule specifically says to count both the starting date and target date.
September 1 to September 15 is 14 days using standard date subtraction, or 15 counted dates when both endpoints are included.
Use the add or subtract days calculator to find a date from an offset, the days between dates calculator for two fixed dates, and the business days calculator for weekdays.
A December 1 start date and December 31 target date have 30 elapsed days between them. Inclusive mode counts the first day as well, making 31 calendar dates.
Enter a fixed starting date to make countdown results reproducible instead of relying on today's changing date.
This is calendar-day counting, not a promise about delivery or business-day deadlines; the start-date default changes with the day.
Continue with: Days Between Dates Calculator · Business Days Calculator
Yes. If the target is earlier than the starting date, the result switches to days since target.
Yes. This is a calendar-day countdown.
See how formulas, sources and limitations are handled across ERICH Calculators.