Some Use full date functions in c#.net

byZafar Ali Khan Post a Comment
Some usefull date functions(Days between two dates, working days between two dates,Months between two dates,off days between two dates)
you can use this class in many projects 

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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Web;

namespace MyApp.Common
{
    /// <summary>
    /// DateTime Extension Methods
    /// </summary>
    public static class DateTimeExtensions
    {
        /// <summary>
        /// return true if day is not(sunday or Saturday)
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public static bool IsWorkingDay(this DateTime date)
        {
            return date.DayOfWeek != DayOfWeek.Sunday && date.DayOfWeek!= DayOfWeek.Saturday;
        }
    }
    /// <summary>
    /// day day_name and date
    /// </summary>
    public class Date_Properties
    {
        public int Day { get; set; }
        public bool IsWorkingDay { get; set; }
        public string DayName { get; set; }
        public DateTime Date { get; set; }
        public bool IsHoliday { get; set; }
        public string DateTimeString { get; set; }
    }
    /// <summary>
    /// Date Time functions
    /// </summary>
    public class DateTime_Tools
    {
        private DateTime _startDate;
        private DateTime _endDate;
        public DateTime_Tools()
        {
            _startDate = DateTime.Today.Date;
            _endDate = DateTime.Today.Date.AddDays(30);
        }
        public DateTime_Tools(DateTime startDate, DateTime endDate)
        {
            _startDate = startDate;
            _endDate = endDate;
        }
        /// <summary>
        /// Returns All dates between startDate and EndDate
        /// </summary>
        /// <returns>List of DateTime</returns>
        public List<DateTime> AllDates()
        {
            List<DateTime> dates = new List<DateTime>();
            if (_startDate == _endDate)
            {
                dates.Add(_startDate);
                return dates;
            }
            for (var d = _startDate; d <= _endDate; d = d.AddDays(1))
            {
                dates.Add(d.Date);
            }
            return dates;
        }
        /// <summary>
        /// returns only off days between two dates (sundays and saturdays)
        /// </summary>
        /// <returns></returns>
        public List<DateTime> OffDays()
        {
          var dates=  (from date in AllDates().Where(d => d.IsWorkingDay()==false) select date).ToList();
          return dates;
        }
        /// <summary>
        /// Returns only working dates eleminates (sunday and sturday)
        /// </summary>
        /// <returns></returns>
        public List<DateTime> WorkingDates()
        {
            List<DateTime> dates = new List<DateTime>();
            for (var d = _startDate; d <= _endDate; d = d.AddDays(1))
            {
                if (d.IsWorkingDay())
                {
                    dates.Add(d.Date);
                }
            }
            return dates;
        }
        /// <summary>
        /// Number of working days between startdate and End date
        /// </summary>
        /// <returns></returns>
        public int WorkingDays()
        {
            int count = (from date in AllDates().Where(d => d.IsWorkingDay()) select date).ToList().Count;
            return count;
        }
        /// <summary>
        /// Returns number of days between two dates
        /// </summary>
        /// <returns></returns>
        public int AllDays()
        {          
           return AllDates().Count;
        }
        /// <summary>
        /// return List of Date_Properties between to dates
        /// </summary>
        /// <returns></returns>
        public List<Date_Properties> AllDays_Names()
        {
            List<Date_Properties> _toReturn = new List<Date_Properties>();
            _toReturn = (from d in AllDates() select d).ToList().Select(x => new Date_Properties()
            {
                Day = x.Day,
                IsWorkingDay = x.IsWorkingDay(),
                Date = x.Date,
                DayName = x.DayOfWeek.ToString(),
                DateTimeString = x.ToString("dd/MMM/yyyy"),
                IsHoliday = false
            }).ToList();
            return _toReturn;
        }
        /// <summary>
        /// Retuns Month and year between two dates output=> { {  "January", 2011  }, {  "February", 2011  }}
        /// </summary>
        /// <returns></returns>
        public IEnumerable<Tuple<string, int>> MonthsBetween()
        {
            DateTime iterator;
            DateTime limit;

            if (_endDate > _startDate)
            {
                iterator = new DateTime(_startDate.Year, _startDate.Month, 1);
                limit = _endDate;
            }
            else
            {
                iterator = new DateTime(_endDate.Year, _endDate.Month, 1);
                limit = _startDate;
            }

            var dateTimeFormat = CultureInfo.CurrentCulture.DateTimeFormat;
            while (iterator <= limit)
            {
                yield return Tuple.Create(
                    dateTimeFormat.GetMonthName(iterator.Month),
                    iterator.Year);
                iterator = iterator.AddMonths(1);
            }
        }       
       

        public DateTime StarDate { get { return _startDate; } set { _startDate = value; } }
        public DateTime EndDate { get { return _endDate; } set { _endDate = value; } }
    }
}

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