Patent ID: 8385156

Claim:
A radio-controlled adjustment timepiece comprising: a receiver which receives a standard wave containing time information and received daylight saving information indicating whether or not the time information is provided by being adjusted by a time adjustment value for a period of daylight saving time, a clock which keeps a clock time; a storer which stores a period of daylight saving time set in advance independently from the received daylight saving information contained in regards to the period of daylight saving time in the standard wave; a first adjuster which adjusts the clock time to match the time information received by the receiver; a controller which, when information which indicates that the first adjuster performed the adjustment and the received daylight saving information upon the adjustment by the first adjuster are notified, references to the contents stored in the storer and a stored daylight saving information, determines whether a present point is in a set daylight saving time period, specifies a current time, and adjusts the clock time after the adjustment by the first adjuster, by the specified current time; and a notifier which notifies the information which indicates that the first adjuster performed the adjustment and the stored daylight saving information upon the adjustment by the first adjuster to the controller, wherein the controller detects whether the clock time after the adjustment by the first adjuster includes the time adjustment value from the stored daylight saving information notified by the notifier, when detecting that the clock time after the adjustment by the first adjuster includes the time adjustment value, subtracts the time adjustment value from the clock time, determines whether the clock time derived by subtracting the time adjustment value is in the set daylight saving time period, when determining that the clock time derived by subtracting the time adjustment value is in the set daylight saving time period, specifies the clock time derived by subtracting the time adjustment value plus the time adjustment value as the current time, and when determining that the clock time derived by subtracting the time adjustment value is not in the set daylight saving time period, specifies the clock time derived by subtracting the time adjustment value as the current time, and when detecting that the clock time after the adjustment by the first adjuster does not include the time adjustment value, determines whether the clock time is in the set daylight saving time period, when determining that the clock time is in the set daylight saving time period, specifies the clock time plus the time adjustment value as the current time, and when determining that the clock time is not in the set daylight saving time period, specifies the clock time as the current time, and adjusts by the specified current time the clock time after the adjustment by the first adjuster.