设置间隔一周的算法

date ldt_s_day,ldt_e_day

int day1[7] ={-4,-5,-6,0,-1,-2,-3}
int day2[7] ={2,1,0,6,5,4,3}
ldt_s_day = RelativeDate(ldt_day ,day1[DayNumber(ldt_day)])
ldt_e_day = RelativeDate(ldt_day ,day2[DayNumber(ldt_day)])

em_1.text=string(ldt_s_day,'yyyy-mm-dd')
em_2.text=string(ldt_e_day,'yyyy-mm-dd')