从datetimepicker获取周数

Question

如何获取datetimepicker中的星期数就像在Mysql中一样只使用函数WEEK（） 它会返回周数，就像那样简单。

例如

datetimepicker1.text = "9/9/2014"
'returns 36

just like in mysql. example.

WEEK(9/9/2014)
`returns 36

Answer 1

您可以使用Calendar.GetWeekOfYear

Dim dt = datetimepicker1.Value 
Dim dateInfo = Globalization.DateTimeFormatInfo.CurrentInfo
Dim c = dateInfo.Calendar

Dim week = c.GetWeekOfYear(dt, dateInfo.CalendarWeekRule, dateInfo.FirstDayOfWeek)