Daylight saving time ( DST ; also, summer time in British English; see Terminology) is the convention of advancing clocks so that afternoons have more daylight and mornings have less.

• 夏令时（简称DST，在不列颠英语中也可以叫夏季时间；查看专有名词）是提前时钟的公约，因此下午时间更长，上午时间变短。