Event time management in an electric vehicle charging station without a battery-backed real time clock

Abstract

An electric vehicle charging station, which does not include a battery-backed Real Time Clock, is in a charging station network managed by a charging station network server. Upon booting, the charging station requests actual real time from a remote source. While the charging station has not received the actual real time, it records the time of charging station specific events in a local system time format that resets when the charging station loses power. The charging station maintains the events recorded in their local system time until actual time is received. When actual real time is received, the charging station synchronizes its local system clock with the actual real time and converts the time of each event into real time format. When actual time is received, the charging station converts the time of each event into real time format. After the time of the events are converted to real time format, they are communicated to the charging station network server for further processing. After synchronizing its local clock with actual real time, the charging station records the time of any subsequent events in actual real time.