Oge nchekwa ụbọchị (DST), nke a na-akpọkwa dị ka oge nchekwa ụbọchị ma ọ bụ naanị oge ìhè (United States, Canada, na Australia), na oge okpomọkụ (United Kingdom, European Union, na ndị ọzọ), bụ omume nke ịga n'ihu elekere (na-emekarị.
by one hour) n'oge okpomọkụ nke mere na ọchịchịrị daa n'oge elekere ọzọ. Ihe omume DST na-ahụkarị bụ ịtọ elekere n'ihu otu elekere n'oge opupu ihe ubi ("mmiri n'ihu"), na ịtọghachi elekere azụ n'otu elekere n'oge mgbụsị akwụkwọ ("daghachi azụ") iji laghachi n'oge ọkọlọtọ. N'ihi ya, e nwere otu ụbọchị na-ewe awa 23 n'oge oyi ma ọ bụ n'oge opupu ihe ubi na otu ụbọchị nke awa 25 n'oge mgbụsị akwụkwọ.
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