What this calculator does
Use this countdown calculator to see how long remains until an event, deadline, trip, birthday or launch date.
Formula used
The calculator counts calendar days between the start date and target date, then converts the same interval to weeks and approximate months.
How to read the result
Inclusive counting adds the target date as a full day. Use it when both the first and final dates should count.
Assumptions
- Uses calendar dates only.
- Months are approximate.
- The target date must be on or after the start date.
Sources and checks
This calculator uses a standard public formula. Where rules or thresholds can change, source links are listed on the relevant page.
Frequently asked questions
Why are months approximate?
Months have different lengths, so the calculator uses the average calendar month for a simple comparison.