獲取當天是當年 當月的第幾周

引用命名空間：

using system.globalization;

示例**：

datetime date =datetime.now;

//獲取指定時間是當年的第幾周
gregoriancalendar gc = new
gregoriancalendar();
int weekofyear =gc.getweekofyear(date, calendarweekrule.firstday, dayofweek.monday);
console.writeline(
"是當年的第周
", date.tostring("
yyyy年mm月dd日
"), weekofyear);
console.readkey();
//獲取是當月的第幾周
int dayinmonth =date.day;
//本月第一天  
datetime firstday = date.adddays(1 -date.day);
//本月第一天是週幾  
int weekday = (int)firstday.dayofweek == 0 ? 7 : (int
)firstday.dayofweek;
//本月第一周有幾天  
int firstweekendday = 7 - (weekday - 1
);            
//當前日期和第一周之差  
int diffday = dayinmonth -firstweekendday;
diffday = diffday > 0 ? diffday : 1
;            
//當前是第幾周,如果整除7就減一天  
int weeknuminmonth = ((diffday % 7) == 0
? (diffday / 7 - 1
)             : (diffday / 7)) + 1 + (dayinmonth > firstweekendday ? 1 : 0
);            console.writeline(
"是當月的第周
", date.tostring("
yyyy年mm月dd日
"), weeknuminmonth);
console.readkey();

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