Days Between Dates: Your Questions Answered
These are the questions people ask most often about days between dates. Each answer is short; follow the links for the full detail.
What does a days between dates calculation tell me?
Counts days between two dates.
What is the formula?
Days = end − start.
What do I need to enter?
Start date, End date.
Does this count Singapore public holidays?
No. It counts calendar days or weekdays. Subtract any public holidays in the period yourself.
Can you show an example?
For example, with these inputs:
- Start date: 1 Jan 2026
- End date: 31 Dec 2026
the calculator returns:
- Days between: 364 days
- Weeks: 52.00 weeks
- Including end date: 365 days
Any tips?
- Leap years add a 29 February every four years, except most century years.
- Months have different lengths, so 'one month' is not always 30 days.
- Write dates in an unambiguous format such as 5 Oct 2026 when sharing deadlines.
Background
The Gregorian calendar has months of 28 to 31 days and adds a leap day almost every four years, which makes counting days by hand surprisingly error-prone. Converting dates to day numbers and subtracting avoids the problem.
Many Singapore rules are expressed in days: notice periods, leave entitlements, stamp duty deadlines and probation periods. Whether the count includes the start or end date, and whether weekends count, changes the answer.
When sharing dates internationally, write the month as a word to avoid confusion between day-month and month-day formats.
Related calculations
- Day of the Week Calculator: Tells you which weekday any date falls on.
- Weeks Between Dates Calculator: Counts weeks between two dates.
- Months Between Dates Calculator: Counts complete calendar months between two dates.
- Time Duration Calculator: Calculates hours and minutes between two times, including overnight shifts.
Try it yourself with the Days Between Dates Calculator.
Run your own numbers: Days Between Dates Calculator