What can I do?Īs shown in the picture below, make sure you are in an area with few surrounding trees, buildings, or other objects which may obstruct the satellite signal. The calendar on my watch changes at about noon.However, their alternative years are not leap years and their calendars will become unmatched with the actual ones after February 29.In those leap years, you must set another alternative year or "alternative year from March 1" after March 1. The calendar function of old watches may sometimes be limited (for example, from 1992 to 2004) and not cover recent years. Why does setting an alternative year make date and day of week indication correct?.(The next period of the same kind is from 2301 to 2499, about 300 years later.)As a result, it is regarded sufficient for most of computers and other devices to be equipped with the calendar with the simple leap year rule that "A year divisible with 4 is a leap year." and that causes no problems in most cases.However, the year 2100 is not a leap year as it is divisible by 4 but not by 400 and ends with 00 and the simple rule above will become ineffective and the calendar will become incorrect. Consequently, the years from 1901 to 2099 is a little rare 199-year period when a leap year comes every four years with no exception. A year whose last two digits are divisible by 4 is a leap year and its days become 366 by an extra day being added.However, there is a supplemental definition for the leap year as follows:・A year whose last two digits are 00 is NOT a leap year except for the year is divisible by 400.The year 2000 has 00 as the last two digits but it is divisible by 400, making it a leap year. When applied, the first priority of insertion is given to the end of December and June, and the second priority to those at the end of March and September.After insertion of a leap second, the time on your watch gets one-second faster than before.Be sure to adjust the time on the watch.Signals which radio controlled watches use contain updated leap second information and the watches adjust the time automatically as they receive signals after leap-second insertion. Because the Earth's rotational time varies, a leap second is not applied regularly. The International Earth Rotation Service (IERS) makes the decision of when to insert a leap second in UTC. ![]() A leap second is inserted in order to adjust the time difference between UTC (Coordinated Universal Time, the international time standard), which is defined by atomic clocks using the frequency of the Cesium atom, and UT1 (UT: Universal Time), which is derived from the Earth's actual rotation.
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