If given object is date, returns date of first day of the week representing by the given date. - CSharp System

CSharp examples for System:DateTime Day

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Description

If given object is date, returns date of first day of the week representing by the given date.

Demo Code

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using System.Globalization;
using System;//w  w  w.j a va  2 s. c o m

public class Main{
        //-------------------------------------------------------------------------
    /// <summary>
    /// If given object is date, returns date of first day of the week representing by the given date.
    /// </summary>
    /// <param name="dateObj">date to get first day of week for</param>
    /// <returns>date of first day of the week</returns>
    static public object GetFirstWeekDay(object dateObj)
    {
      DateTime date;
      if (Parse(dateObj, out date))
      {
        return GetFirstWeekDay(date);
      }
      return dateObj;
    }
        //-------------------------------------------------------------------------
    /// <summary>
    /// Returns date of first day of the week representing by the given date.
    /// </summary>
    /// <param name="date">date to get first day of week for</param>
    /// <returns>date of first day of the week</returns>
    static public DateTime GetFirstWeekDay(DateTime date)
    {
      int firstWeekDay = Convert.ToInt32(CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek);
      int dateWeekDay = Convert.ToInt16(date.DayOfWeek);
      int difference = dateWeekDay - firstWeekDay;
      if (difference < 0)
      {
        difference = 7 + difference;
      }
      return difference > 0 ? date.AddDays(-difference) : date;
    }
        //-------------------------------------------------------------------------
    /// <summary>
    /// Parses datetime value using standard format.
    /// </summary>
    /// <param name="o">value to parse</param>
    /// <returns>parsed datetime value</returns>
    static public DateTime Parse(object o, DateTime defaultValue)
    {
      DateTime d;
      if (Parse(o, out d))
      {
        return d;
      }
      else
      {
        return defaultValue;
      }
    }
        //--------------------------------------------------------------------------
    /// <summary>
    /// Parses datetime value using standard format.
    /// </summary>
    /// <param name="o">value to parse</param>
    /// <returns>parsed datetime value</returns>
    static public bool Parse(object o, out DateTime d)
    {
      d = DateTime.MinValue;
      if (CxUtils.IsEmpty(o))
      {
        return false;
      }
      if (o is DateTime)
      {
        d = (DateTime)o;
        return true;
      }
      try
      {
        d = Convert.ToDateTime(o);
        return true;
      }
      catch
      {
        return false;
      }
    }
}

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