Days between two dates
Count the days from one date to another, and handle leap years for you.
Both financial models count days for you. Dates are typed as month.dayyear in the default US order, for example June 15, 2026 is 6.152026.
Classic Financial II
Start on the main screen: Press 2ND then CPT (QUIT) to leave a worksheet and return to the plain calculator. ON/OFF also drops back to the standard screen and clears an error.
Open the date worksheet (2nd, 5). Enter the first date, then move down.
2NDDATE56.152026ENTER↓Enter the second date (December 25, 2026). Move down to DBD and press CPT.
12.252026ENTER↓CPT
You should seeThere are 193 actual days between the two dates.
RPN Financial 12
Start on the main screen: There is no menu to leave: the display always shows the X register. Press f then R/S (P/R) to leave program mode, and clear a pending prefix by pressing ON.
Type the first date and press ENTER.
6.152026ENTERType the second date, then press g and the EEX key (ΔDYS).
12.252026gΔDYSEEX
You should see193.00
The display shows actual days. The next stack line down holds the count on a 30-days-a-month basis (190).
Tips
- If a date is rejected, check the month and day are in the right order for your date format.