perfect attendance and punctuality
A set phrase used in school or workplace contexts to describe someone who has never been late or absent. Often appears on certificates or in evaluations.
He was commended for three years of perfect attendance and punctuality.
I get up early every morning aiming for perfect attendance and punctuality.
皆勤 means full attendance without absence, but does not explicitly include punctuality. 無遅刻無欠席 covers both no lateness and no absence.
Compound of 無遅刻 (no lateness) and 無欠席 (no absence). The exact historical derivation is uncertain, but it is a straightforward modern set phrase.