Hacking Seconds is a feature found in some watches that allows the wearer to stop the watch’s second hand while the watch is still running, allowing the user to ensure the time is set to the exact second. This is a useful feature for setting the time precisely, and for ensuring the accuracy of any chronograph or timing functions. The name “Hacking Seconds” comes from the fact that the feature was originally developed for use by military personnel, who needed to be able to synchronize their watches with each other.
