一、1987年夏时制从4月12日(星期日)开始至9月13日(星期日)结束。4月12日凌晨2时将钟表拨快1小时,即从2时拨为3时;9月13日凌晨2时将钟表拨慢1小时,即从2时拨为1时。在此期间,广播电台等报时单位报时,应将“北京时间”改称“北京夏令时”。各地方和铁道、民航、交通、邮电、广播影视、气象、城市公共交 First, the summer time in 1987 started from April 12 (Sunday) to September 13 (Sunday). The clock will be dialed for 1 hour at 2:00 am on April 12, that is, from 2:00 to 3:00. On the morning of September 13, the clock will be dialed down by 1 hour, that is, from 2:00 to 1:00. During this period, radio and other units reporting time, should be “Beijing time ” renamed “Beijing summer time ”. Localities and railways, civil aviation, transportation, post and telecommunications, radio and television, meteorology, urban public exchange