Shelf-life Date Calculator
Calculate an expiry date from an explicit production date in days, months or years, clamping to the target calendar month end.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Start date and period
Calculated date
Calendar date arithmetic, not a safety assessment.
Enter a start date and period
What this tool does
- Project a label date from a production date.
- Handle month-end arithmetic boundaries.
- Use deterministic day, month or year arithmetic.
Example
Input
2024-01-31 1
Output
2024-01-31 + 1 months = 2024-02-29
Input YYYY-MM-DD and a non-negative integer. Months/years use calendar arithmetic and clamp to month-end. Date math is not food-safety advice; confirm whether labels count the first or expiry day.
Frequently asked questions
Does this decide whether food is safe?
No, it only calculates dates.
What is Jan 31 plus one month?
It clamps to the last day of the target month.
Is the production day counted as day one?
The tool applies a date offset; label counting rules must be confirmed separately.
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