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### CET
欧洲中部时间(英語:Central European Time,CET)是比世界标准时间(UTC)早一个小时的时区名称之一。它被大部分欧洲国家和部分北非国家采用。冬季时间为UTC+1,夏季欧洲夏令时为UTC+2。
### UTC
协调世界时,又称世界标准时间或世界协调时间,简称UTC,从英文“Coordinated Universal Time”/法文“Temps Universel Cordonné”而来。台湾采用CNS 7648的《资料元及交换格式–资讯交换–日期及时间的表示法》(与ISO 8601类似)称之为世界统一时间。中国大陆采用ISO 8601-1988的国标《数据元和交换格式信息交换日期和时间表示法》(GB/T 7408)中称之为国际协调时间。协调世界时是以原子时秒长为基础,在时刻上尽量接近于世界时的一种时间计量系统。
### GMT
格林尼治标准时间(旧译格林尼治平均时间或格林威治标准时间;英语:Greenwich Mean Time,GMT)是指位于英国伦敦郊区的皇家格林尼治天文台的标准时间,因为本初子午线被定义在通过那里的经线。
### CST
北京时间,China Standard Time,又名中国标准时间,是中国的标准时间。在时区划分上,属东八区,比协调世界时早8小时,记为UTC+8,与中华民国国家标准时间(旧称“中原标准时间”)、香港时间和澳门时间和相同。當格林威治時間為凌晨0:00時,中國標準時間剛好為上午8:00。
### 关系
CET=UTC/GMT + 1小时
CST=UTC/GMT +8 小时
CST=CET+9
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