DateTimeExtensions

DateTimeExtensions.cs

using System;

namespace Xrisdoc.Extensions
{	
    public static class DateTimeExtensions
    {
        /// <summary>
        /// Identifies whether or not the specified period is a monthly period
        /// </summary>
        /// <param name="startDate">The start date of the period</param>
        /// <param name="endDate">The end date of the period</param>
        /// <returns>A boolean value indicating if the specified period is a monthly period or not</returns>
        public static bool IsMonthPeriod(DateTime startDate, DateTime endDate)
        {
            if (startDate.IsSameMonthAs(endDate) && startDate.IsFirstDayOfMonth() && endDate.IsLastDayOfMonth())
            {
                return true;
            }

            return false;
        }
        
        /// <summary>
        /// Gets the age in relation to the current date
        /// </summary>
        /// <param name="date"></param>
        /// <returns>An integer representing the relevant age</returns>
        public static int GetCurrentAge(this DateTime date)
        {
            DateTime today = DateTime.Today;
            int age = today.Year - date.Year;
            if (date > today.AddYears(-age)) age--;
            return age;
        }

        /// <summary>
        /// Gets the date for the first day of the current month
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public static DateTime GetFirstDayOfMonth(this DateTime date)
        {
            return new DateTime(date.Year, date.Month, 1);
        }

        /// <summary>
        /// Gets the date for the first day of the specified month
        /// </summary>
        /// <param name="month">The month that the first day of the month is to be obtained for</param>
        /// <param name="year">The year that the first day of the month is to be obtained for</param>
        /// <returns></returns>
        public static DateTime GetFirstDayOfMonth(int month, int year)
        {
            return new DateTime(year, month, 1);
        }

        /// <summary>
        /// Gets the date for the last day of the current month
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public static DateTime GetLastDayOfMonth(this DateTime date)
        {
            return new DateTime(date.Year, date.Month, DateTime.DaysInMonth(date.Year, date.Month));
        }

        /// <summary>
        ///  Gets the date for the last day of the specified month
        /// </summary>
        /// <param name="month">The month that the last day of the month is to be obtained for</param>
        /// <param name="year">The year that the last day of the month is to be obtained for</param>
        /// <returns></returns>
        public static DateTime GetLastDayOfMonth(int month, int year)
        {
            return new DateTime(year, month, DateTime.DaysInMonth(month, year));
        }

        /// <summary>
        /// Checks to see if the current date is the first day of the month
        /// </summary>
        /// <param name="date"></param>
        /// <returns>True if it is the firts day of the month. Otherwise return false</returns>
        public static bool IsFirstDayOfMonth(this DateTime date)
        {
            return date.Day == 1;
        }

        /// <summary>
        /// Checks to see if the current date is the last day of the month
        /// </summary>
        /// <param name="date"></param>
        /// <returns>True if it is the last day of the month. Otherwise return false</returns>
        public static bool IsLastDayOfMonth(this DateTime date)
        {
            return date.CompareTo(GetLastDayOfMonth(date)) == 0;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="date"></param>
        /// <param name="dateToComapreTo"></param>
        /// <returns></returns>
        public static bool IsSameMonthAs(this DateTime date, DateTime dateToComapreTo)
        {
            return date.Month == dateToComapreTo.Month && date.Year == dateToComapreTo.Year;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="date"></param>
        /// <param name="month"></param>
        /// <param name="year"></param>
        /// <returns></returns>
        public static bool IsSameMonthAs(this DateTime date, int month, int year)
        {
            return date.Month == month && date.Year == year;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public static bool IsCurrentMonth(this DateTime date)
        {
            return date.Month == DateTime.Today.Month && date.Year == DateTime.Today.Year;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public static bool IsCurrentMonth(int month, int year)
        {
            return month == DateTime.Today.Month && year == DateTime.Today.Year;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public static bool IsCurrentYear(this DateTime date)
        {
            return date.Year == DateTime.Today.Year;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="year"></param>
        /// <returns></returns>
        public static bool IsCurrentYear(int year)
        {
            return year == DateTime.Today.Year;
        }
    }
}