As time goes by.

The timing of birth-related events may influence neonatal outcome and is often pivotal in medicolegal cases. This prospective observational study determined the variation in displayed time on timepieces in a regional maternity unit which could result in inaccuracies of time documentation. The mean (95% CI) difference between time displayed and true time was sec (+/- 2 min 4 sec) for delivery room clocks and +1 m 8 s (+/- 7 m 12 s) for resuscitation room clocks. The maximum discrepancy between delivery room and resuscitation room clocks was 7 m 52 s. The abilities of staff to estimate the duration of time passed was also assessed. The mean (95% CI) five-minute estimate was 4 m 52 s (+/- 3 m 12 s). These disparities could have considerable medicolegal significance, and should be taken into consideration in risk management studies. Maternity units should move towards synchronising all timepieces. Meanwhile, statements about the precise timing of events should be regarded with suspicion.