// crudwork
// Copyright 2004 by Steve T. Pham (http://www.crudwork.com)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with This program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Text;

namespace crudwork.Utilities
{
  /// <summary>
  /// Date Utility
  /// </summary>
  public class DateUtil
  {
    
    /// <summary>
    /// Return a unique identifier based on system&#039;s full date (yyyymmdd) and time (hhmissms).
    /// 
    /// Output sample: 2006040212445099
    /// </summary>
    public static string UniqueID
    {
      get
      {
        DateTime date = DateTime.Now;

        string uniqueID = String.Format(
          "{0:0000}{1:00}{2:00}{3:00}{4:00}{5:00}{6:000}",
          date.Year, date.Month, date.Day,
          date.Hour, date.Minute, date.Second, date.Millisecond
          );
        return uniqueID;
      }
    }
   }
}

   
     

   
 
using System;
public class MainClass{
        /// <summary>
        /// Gets the days between.
        /// </summary>
        /// <param name="first">The first.</param>
        /// <param name="last">The last.</param>
        /// <param name="inclusive">if set to <c>true</c> [inclusive].</param>
        /// <returns></returns>
        public static int GetDaysBetween(DateTime first, DateTime last, bool inclusive)
        {
            TimeSpan span = last - first;

            return inclusive ? span.Days + 1 : span.Days;
        }
        /// <summary>
        /// Gets the months between.
        /// </summary>
        /// <param name="first">The first.</param>
        /// <param name="last">The last.</param>
        /// <param name="inclusive">if set to <c>true</c> [inclusive].</param>
        /// <returns></returns>
        public static int GetMonthsBetween(DateTime first, DateTime last, bool inclusive)
        {
            int result = GetDaysBetween(first, last, true) / 30;
            return inclusive ? result + 1 : result;
        }
}

   
     

   
 
using System;
public class MainClass{
        /// <summary>
        /// Gets the end of year.
        /// </summary>
        /// <param name="date">The date.</param>
        /// <returns></returns>
        public static DateTime GetEndOfYear(DateTime date)
        {
            return new DateTime(new DateTime(date.Year + 1, 1, 1).Ticks - 1);
        }
}

   
     

using System;
public class MainClass{
///

/// The date. ///
public static int GetDaysInYear(DateTime date)
{
if (date.Equals(DateTime.MinValue))
{
return -1;
}

DateTime thisYear = new DateTime(date.Year, 1, 1);
DateTime nextYear = new DateTime(date.Year + 1, 1, 1);

return (nextYear – thisYear).Days;
}
///

/// The date. ///
public static DateTime GetEndOfQuarter(DateTime date)
{
int daysInYear = GetDaysInYear(date);
double quarter = ((double)date.DayOfYear) / ((double)daysInYear);

if (quarter < 0.25) { return new DateTime(new DateTime(date.Year, 4, 1).Ticks - 1); } else if (quarter < 0.5) { return new DateTime(new DateTime(date.Year, 7, 1).Ticks - 1); } else if (quarter < 0.75) { return new DateTime(new DateTime(date.Year, 10, 1).Ticks - 1); } else { return new DateTime(new DateTime(date.Year + 1, 1, 1).Ticks - 1); } } } [/csharp]

   
 
using System;
public class MainClass{
        /// <summary>
        /// Gets the end of month.
        /// </summary>
        /// <param name="date">The date.</param>
        /// <returns></returns>
        public static DateTime GetEndOfMonth(DateTime date)
        {
            return new DateTime(new DateTime(date.Year, date.Month + 1, 1).Ticks - 1);
        }
}

   
     

   
 
using System;
public class MainClass{
        /// <summary>
        /// Gets the start of month.
        /// </summary>
        /// <param name="date">The date.</param>
        /// <returns></returns>
        public static DateTime GetStartOfMonth(DateTime date)
        {
            return new DateTime(new DateTime(date.Year, date.Month, 1).Ticks);
        }
}

   
     

   
 
using System;
public class MainClass{
        /// <summary>
        /// Gets the end of day.
        /// </summary>
        /// <param name="date">The date.</param>
        /// <returns></returns>
        public static DateTime GetEndOfDay(DateTime date)
        {
            return new DateTime(date.Ticks - 1);
        }
}