Japan Standard Time or JST (Japanese: 日本標準時 Nihon Hyōjunji or 中央標準時 Chūō Hyōjunji) is the standard timezone in Japan, and is 9 hours ahead of UTC, i.e. it is UTC+09:00.
There is no daylight saving time, though its introduction has been debated several times. During World War II, it was often called Tokyo Standard Time.
Japan Standard Time is the same as Korean Standard Time, Indonesian Eastern Standard Time and Irkutsk Time.
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is one of several closely related successors to Greenwich Mean Time (GMT). For most purposes, UTC is synonymous with GMT, but GMT is no longer precisely defined by the scientific community.
Daylight saving time (DST)—also summer time in several countries[1][2][3][4][5][6] in British English, and European official terminology (see Terminology)—is the practice of advancing clocks so that evenings have more daylight
and mornings have less. Typically clocks are adjusted forward one hour
near the start of spring and are adjusted backward in autumn.[7]
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