A time server device may send a first message to a client device, capturing and storing the time value of the time server clock when the first message is sent. When the first message is received by the client device, the client device starts a timer. At some later time, the time server device sends a second message to the client device that includes the stored time value. The clock of the client device may be updated based at least in part on the value of the timer and the received time value.