Get date of first Monday of the week? [duplicate]

Answer 1

Try this:

public DateTime FirstDayOfWeek(DateTime date)
{
    var candidateDate=date;
    while(candidateDate.DayOfWeek!=DayOfWeek.Monday) {
        candidateDate=candidateDate.AddDays(-1);
    }
    return candidateDate;
}

EDIT for completeness: overload for today's date:

public DateTime FirstDayOfCurrentWeek()
{
    return FirstDayOfWeek(DateTime.Today);
}