C#时间函数扩展

2024-07-21 02:18:15

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//本周是本年第几周

private int datepart(system.datetime dt)
{
int weeknow = convert.toint32(dt.dayofweek);//今天星期几
int daydiff = (-1) * (weeknow+1);//今日与上周末的天数差
int days = system.datetime.now.adddays(daydiff).dayofyear;//上周末是本年第几天
int weeks = days/7;
if(days%7 != 0)
{
weeks++;
}
//此时，weeks为上周是本年的第几周
return (weeks+1);
}

//本周起止日期

private string weekrange(system.datetime dt)
{
int weeknow = convert.toint32(dt.dayofweek);
int daydiff = (-1) * weeknow;
int dayadd = 6-weeknow;
string datebegin = system.datetime.now.adddays(daydiff).date.tostring("mm月dd日");
string dateend = system.datetime.now.adddays(dayadd).date.tostring("mm月dd日");
return datebegin + " - " +dateend;
}

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