Yuebon.NetCore/Yuebon.Commons/Extensions/DateTimeExtensions.cs

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/*******************************************************************************
 * Copyright © 2017-2020 Yuebon.Framework 版权所有
 * Author: Yuebon
 * Description: Yuebon快速开发平台
 * Website：http://www.yuebon.com
*********************************************************************************/
using System;
 

namespace Yuebon.Commons.Extensions
{
    /// <summary>
    /// 日期时间扩展
    /// </summary>
    public static class DateTimeExtensions
    {
        /// <summary>
        /// 
        /// </summary>
		public static readonly DateTime BeginOfEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

        /// <summary>
        /// Converts a nullable date/time value to UTC.
        /// </summary>
        /// <param name="dateTime">The nullable date/time</param>
        /// <returns>The nullable date/time in UTC</returns>
        public static DateTime? ToUniversalTime(this DateTime? dateTime)
        {
            return dateTime.HasValue ? dateTime.Value.ToUniversalTime() : (DateTime?)null;
        }

        /// <summary>
        /// Converts a nullable UTC date/time value to local time.
        /// </summary>
        /// <param name="dateTime">The nullable UTC date/time</param>
        /// <returns>The nullable UTC date/time as local time</returns>
        public static DateTime? ToLocalTime(this DateTime? dateTime)
        {
            return dateTime.HasValue ? dateTime.Value.ToLocalTime() : (DateTime?)null;
        }


        /// <summary>
        /// Returns a date that is rounded to the next even hour above the given
        /// date.
        /// <p>
        /// For example an input date with a time of 08:13:54 would result in a date
        /// with the time of 09:00:00. If the date's time is in the 23rd hour, the
        /// date's 'day' will be promoted, and the time will be set to 00:00:00.
        /// </p>
        /// </summary>
        /// <param name="dateTime">the Date to round, if <see langword="null" /> the current time will
        /// be used</param>
        /// <returns>the new rounded date</returns>
        public static DateTime GetEvenHourDate(this DateTime? dateTime)
        {
            if (!dateTime.HasValue)
            {
                dateTime = DateTime.UtcNow;
            }