Obtain the start and end times of a week based on the year and month.

# Region obtains the start time and end time of a week based on the year and month.
Public String regexday (string time)
{
RegEx r = new RegEx ("-"); // split on hyphens.
String [] S = R. Split (time );
Return s [S. Length-1]. tostring ();
}
Public String getweekrange (system. datetime DT)
{
Int weeknow = convert. toint32 (Dt. dayofweek );
Int daydiff = (-1) * weeknow;
Int dayadd = 6-weeknow;
String dateBegin = dt. AddDays (daydiff). Date. ToString ("yyyy-mm-dd ");
String dateEnd = dt. AddDays (dayadd). Date. ToString ("yyyy-mm-dd ");
Return dateBegin + "-" + dateEnd;
}
Public void GetDay (int year, int month, ref string [] weekrangeStart, ref string [] weekrangeEnd)
{

// Week 1
String firstdayofmonth = year + "-" + month + "-1 ";
WeekrangeStart [0] = firstdayofmonth;
Firstdayofmonth = GetWeekRange (Convert. ToDateTime (firstdayofmonth ));
Int firstweeklastday = Convert. ToInt32 (RegexDay (firstdayofmonth ));
WeekrangeEnd [0] = year + "-" + month + "-" + firstweeklastday;

// Week 2
WeekrangeStart [1] = (Convert. ToDateTime (weekrangeEnd [0]). AddDays (1). Date. ToString ("yyyy-MM-dd ");
WeekrangeEnd [1] = (Convert. ToDateTime (weekrangeStart [1]). AddDays (7-1). Date. ToString ("yyyy-MM-dd ");
// Week 3
WeekrangeStart [2] = (Convert. ToDateTime (weekrangeEnd [1]). AddDays (1). Date. ToString ("yyyy-MM-dd ");
WeekrangeEnd [2] = (Convert. ToDateTime (weekrangeStart [2]). AddDays (7-1). Date. ToString ("yyyy-MM-dd ");
// Week 4
WeekrangeStart [3] = (Convert. ToDateTime (weekrangeEnd [2]). AddDays (1). Date. ToString ("yyyy-MM-dd ");
WeekrangeEnd [3] = (Convert. ToDateTime (weekrangeStart [3]). AddDays (7-1). Date. ToString ("yyyy-MM-dd ");
// Week 5
WeekrangeStart [4] = (Convert. ToDateTime (weekrangeEnd [3]). AddDays (1). Date. ToString ("yyyy-MM-dd ");
WeekrangeEnd [4] = (Convert. ToDateTime (weekrangeStart [4]). AddDays (7-1). Date. ToString ("yyyy-MM-dd ");

}
# Endregion