Returns the first day of the week that the specified date is in. - CSharp System

CSharp examples for System:DateTime Week

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Description

Returns the first day of the week that the specified date is in.

Demo Code


using System.Globalization;
using System;/*from   ww  w  . j a v  a2 s . c  o  m*/

public class Main{
        /// <summary>
        /// Returns the first day of the week that the specified date 
        /// is in. 
        /// </summary>
        public static DateTime GetFirstDayOfWeek(this DateTime dayInWeek, CultureInfo cultureInfo)
        {
            DayOfWeek firstDay = cultureInfo.DateTimeFormat.FirstDayOfWeek;
            DateTime firstDayInWeek = dayInWeek.Date;
            while (firstDayInWeek.DayOfWeek != firstDay)
                firstDayInWeek = firstDayInWeek.AddDays(-1);

            return firstDayInWeek;
        }
        /// <summary>
        /// Returns the first day of the week that the specified
        /// date is in using the current culture. 
        /// </summary>
        public static DateTime GetFirstDayOfWeek(this DateTime dayInWeek)
        {
            CultureInfo defaultCultureInfo = CultureInfo.CurrentCulture;
            return GetFirstDayOfWeek(dayInWeek, defaultCultureInfo);
        }
}

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