Patent ID: 7701805

Claim:
A time correction apparatus provided for correcting a present time in an image forming device, the time correction apparatus comprising: an input unit that inputs an input summer time start date/time, an input summer time end date/time, and an amount of time correction for a summer time period, wherein each of the summer time start date/time, the summer time end date/time, and the amount of time correction for the summer time period are modifiable and input by a user; a summer-time information holding unit that holds summer-time information which contains the input summer time start date/time, the input summer time end date/time, and the amount of time correction; a transition time table creation unit that creates a transition time table containing a plurality of summer time transition times of a plurality of years, by computing a summer time start date/time and a summer time end date/time for each of the plurality of years based on the summer-time information from the summer-time information holding unit and by storing the summer time start date/time and the summer time end date/time for each of the plurality of years into the transition time table; a time determining unit that compares the present time with each of the plurality of summer time transition times in the transition time table, and determine whether the present time is within the summer time period, by determining whether the present time is in between a corresponding summer time start date/time and a corresponding summer time end date/time for each of the plurality of years in the transition time table, based on a result of the comparison; and a time correction unit that corrects the present time for the summer time period by adding, to the present time, the amount of time correction in the summer-time information from the summer-time information holding unit, in accordance with a determination result by the time determining unit.