The utility model relates to a timing apparatus, in particular to a male tab clock, comprising a housing and a clock circuit, wherein the clock circuit is arranged inside the housing, the male tab clock is characterized in that the male tab clock also comprises a magnesium male tab and a copper male tab, the magnesium male tab is used as the negative electrode of the clock circuit, the bottom end of the magnesium male tab extends from the bottom end of the housing, the copper male tab is used as the positive electrode of the clock circuit, and the bottom end of the copper male tab extends from the bottom end of the housing. Compared with the prior art, the male tab clock has the beneficial effects that the male tab clock is provided the magnesium male tab and the copper male tab, such that when the male tab clock is not used, the clock circuit does not have a current, thereby effectively saving energy and protecting environment; when the male tab clock is used, it is only needed to insert the magnesium male tab and the copper male tab into a communicated environment with water, such that a current is generated between the magnesium male tab and the copper male tab and the clock circuit can obtain an enough current and begins to work; and the male tab clock is simple in structure and convenient in use, dispenses with a battery, and is small in size and convenient in carrying and storage.