Financial Calculator User Guide
DATE · Date calculation
Choose an instruction to see the matching keys and values. Practice separately in the real calculator.
Open financial calculator ↗Worked examples
Know the mode controls
Enter dates as YYYYMMDD or YYYY/MM/DD and press EXE. Store two rows and SOLVE the third. 365 counts actual calendar days; 360 uses a month convention. A 360-day inverse can have multiple dates: switch to 365 for a unique calendar date.
Review these controls before choosing a case. Keystroke steps show menus opening, selection and closure.
Dys · Open lesson
Dys · Number of Days — Nonnegative whole days between d1 and d2 under the selected basis. 365 counts actual days, including leap days; 360 uses the month convention.
1. Organize the inputs
Count actual days between dates
Find Dys between d1=2022/11/05 and d2=2023/04/27 with the actual-day 365 basis.
| Variable | Input | Action |
|---|---|---|
| d1 | 2022/11/05 | EXE |
| d2 | 2023/04/27 | EXE |
| Dys | Unknown | Select → SOLVE |
2. Follow the keystrokes
Steps 1–6
Steps 7–9
3. Show answer and interpretation
days
The dates differ by 173 days. The 365 setting uses actual dates; it does not ignore leap days.
4. Avoid these mistakes
- Enter YYYYMMDD or YYYY/MM/DD, within 1901–2099, with d2≥d1. An ambiguous inverse under the 360 convention is rejected.
- Finish input with EXE before solving. Clear or changed inputs/settings invalidate earlier results; calculate again.
5. Practice it yourself
The link opens a separate calculator tab. It does not fill, clear or change your calculator's inputs; follow the settings and rows above.
Practice in the financial calculator (new tab) ↗d1 · Open lesson
d1 · Start Date — A valid calendar date from 1901 through 2099, no later than d2. Enter YYYYMMDD or YYYY/MM/DD, rather than arithmetic.
1. Organize the inputs
Start Date — manual workflow
Find a missing date or interval from known calendar conditions. Given d2=20230427 · Dys=173, use the settings below to find d1 manually.
| Variable | Input | Action |
|---|---|---|
| d2 | 2023/04/27 | EXE |
| Dys | 173 | EXE |
| d1 | Unknown | Select → SOLVE |
2. Follow the keystrokes
Steps 1–6
Steps 7–9
3. Show answer and interpretation
date
Start Date: 20221105. A valid calendar date from 1901 through 2099, no later than d2. Enter YYYYMMDD or YYYY/MM/DD, rather than arithmetic.
4. Avoid these mistakes
- Enter YYYYMMDD or YYYY/MM/DD, within 1901–2099, with d2≥d1. An ambiguous inverse under the 360 convention is rejected.
- Finish input with EXE before solving. Clear or changed inputs/settings invalidate earlier results; calculate again.
5. Practice it yourself
The link opens a separate calculator tab. It does not fill, clear or change your calculator's inputs; follow the settings and rows above.
Practice in the financial calculator (new tab) ↗d2 · Open lesson
d2 · End Date — A valid calendar date from 1901 through 2099, no earlier than d1. In a 360-day inverse, month-end conventions can make more than one date valid; use 365 for actual-day arithmetic.
1. Organize the inputs
End Date — manual workflow
Find a missing date or interval from known calendar conditions. Given d1=20221105 · Dys=173, use the settings below to find d2 manually.
| Variable | Input | Action |
|---|---|---|
| d1 | 2022/11/05 | EXE |
| Dys | 173 | EXE |
| d2 | Unknown | Select → SOLVE |
2. Follow the keystrokes
Steps 1–6
Steps 7–9
3. Show answer and interpretation
date
End Date: 20230427. A valid calendar date from 1901 through 2099, no earlier than d1. In a 360-day inverse, month-end conventions can make more than one date valid; use 365 for actual-day arithmetic.
4. Avoid these mistakes
- Enter YYYYMMDD or YYYY/MM/DD, within 1901–2099, with d2≥d1. An ambiguous inverse under the 360 convention is rejected.
- Finish input with EXE before solving. Clear or changed inputs/settings invalidate earlier results; calculate again.
5. Practice it yourself
The link opens a separate calculator tab. It does not fill, clear or change your calculator's inputs; follow the settings and rows above.
Practice in the financial calculator (new tab) ↗Dys · 360 · Open lesson
Dys · 360 · Number of Days · 360 month convention — Nonnegative whole days between d1 and d2 under the selected basis. 365 counts actual days, including leap days; 360 uses the month convention.
1. Organize the inputs
Number of Days · 360 month convention — manual workflow
Find a missing date or interval from known calendar conditions. Given d1=20230101 · d2=20230701, use the settings below to find Dys manually.
| Variable | Input | Action |
|---|---|---|
| d1 | 2023/01/01 | EXE |
| d2 | 2023/07/01 | EXE |
| Dys | Unknown | Select → SOLVE |
2. Follow the keystrokes
Steps 1–6
Steps 7–9
3. Show answer and interpretation
days
Number of Days · 360 month convention: 180. Nonnegative whole days between d1 and d2 under the selected basis. 365 counts actual days, including leap days; 360 uses the month convention.
4. Avoid these mistakes
- Enter YYYYMMDD or YYYY/MM/DD, within 1901–2099, with d2≥d1. An ambiguous inverse under the 360 convention is rejected.
- Finish input with EXE before solving. Clear or changed inputs/settings invalidate earlier results; calculate again.
5. Practice it yourself
The link opens a separate calculator tab. It does not fill, clear or change your calculator's inputs; follow the settings and rows above.
Practice in the financial calculator (new tab) ↗Supported results and operating manual
Targets across the lessons: Dys · d1 · d2
DATE · Operating manual
- Enter d1/d2 (YYYYMMDD or YYYY/MM/DD), then solve Dys; a date and day count can solve the other date.
- Dates are 1901–2099 with d2 ≥ d1.
- Settings selects actual-day 365 or month-convention 360; use 365 when a 360-day inverse is ambiguous.
Keys and settings
Keys and workflow
- ↑↓ selects the active row. The highlighted row is the variable you are editing.
- Enter a number or expression (500*6 or 10000*(1.05)^10), then EXE to evaluate, store and advance. Dates use date input instead of expressions.
- SOLVE calculates the selected unknown/output from the other known values. MATH uses EXE only.
- CLR clears the draft while editing; otherwise it clears only the selected stored variable. Backspace recalls a stored value and deletes its last character, then EXE stores the change. Escape cancels a draft and restores the original value. After EXE advances, select the field you want to change. Clearing a stored input invalidates dependent results. Selecting a read-only result or history row leaves it untouched; settings and MATH history are preserved. MENU offers current-mode clear and calculator reset.
MENU → Fill Example provides working inputs for the current mode. N/A or an error means the inputs/settings do not support a valid result; check the highlighted field and domain restrictions.
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