What rounding does
Time-card rounding replaces an exact punch with a nearby time increment. Common increments include five, six, ten or fifteen minutes. The purpose is usually administrative consistency, not changing the underlying schedule.
Rounding should be distinguished from simply truncating time. Truncation always removes the remainder, while nearest-increment rounding can move a punch earlier or later.
How nearest-increment rounding works
Convert the punch to minutes after midnight, divide by the chosen increment, round to the nearest whole increment and convert the result back to clock time. Apply the same stated method to each punch.
- Keep exact punches in the source record
- Apply one documented method consistently
- Review shifts that cross midnight
- Verify the policy against current requirements
Why small differences accumulate
A few minutes on one shift may look insignificant, but repeated differences can materially change weekly or annual totals. Review rounded totals alongside exact totals when auditing a process.
What a calculator cannot decide
A calculator can show the mathematical effect of a selected increment. It cannot determine whether a workplace policy is lawful, fair or correctly applied in a specific jurisdiction.