Examples
Examples
Try the starting example
- Learning date (YYYY-MM-DD)
- 2026-10-19
- Review offsets from learning date (days)
- 1,3,7
- Excluded weekdays: 1=Mon to 7=Sun, or none
- 6,7
- Excluded dates, comma-separated, or none
- 2026-10-22
- As-of date (YYYY-MM-DD)
- 2026-10-21
- Adjusted review dates
- 2026-10-20, 2026-10-23, 2026-10-26
- Overdue review count
- 1
- Days until next review
- 2
- Same-day review count
- 0
Try another scenario
- Learning date (YYYY-MM-DD)
- 2026-10-23
- Review offsets from learning date (days)
- 1,2,3
- Excluded weekdays: 1=Mon to 7=Sun, or none
- 6,7
- Excluded dates, comma-separated, or none
- none
- As-of date (YYYY-MM-DD)
- 2026-10-26
- Adjusted review dates
- 2026-10-26, 2026-10-26, 2026-10-26
- Overdue review count
- 0
- Days until next review
- 0
- Same-day review count
- 3
Calculation method
Calculation method
Adjusted review dates
For each absolute day offset, move forward until the date is not excluded. Offsets are measured from learning, not from the previous review.
Overdue review count
Adjusted dates strictly before the as-of date; completion is not assumed.
Days until next review
Earliest adjusted date at or after as-of minus as-of; None remaining if all dates have passed.
Same-day review count
Count reviews exactly on the as-of date.
Symbols and units
- a
- Learning date (YYYY-MM-DD)
- b
- Review offsets from learning date (days)
- c
- Excluded weekdays: 1=Mon to 7=Sun, or none
- d
- Excluded dates, comma-separated, or none
- e
- As-of date (YYYY-MM-DD)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- A calendar for your chosen offsets; it makes no memory-performance promise. Exclusions can move multiple reviews to one date, and those reviews remain separate. Dates are civil dates without time zones.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
OpenStax: arithmetic and geometry ↗
Background reading; this does not imply endorsement or independent review of SumFizz.