(エッセンス)2020年6月26日C#クラスライブラリDateTime(拡張方法)

13152 ワード

同前 C〓〓〓類庫/拡張方法同前 asp.net バックエンド

using NodaTime;
using System;
using System.Globalization;

namespace Core.Util
{
     
    public static partial class Extention
    {
     
        ///    
        ///                
        ///    
        ///        
        ///                
        public static int GetWeekOfYear(this DateTime dateTime)
        {
     
            GregorianCalendar gc = new GregorianCalendar();
            return gc.GetWeekOfYear(dateTime, CalendarWeekRule.FirstDay, DayOfWeek.Monday);
        }

        ///


        ///   Js   timestamp
        /// 
        ///   
        /// 
        public static long ToJsTimestamp(this DateTime dateTime)
        {
     
            var startTime = new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime();
            long result = (dateTime.Ticks - startTime.Ticks) / 10000;   // 10000   13 
            return result;
        }

        ///


        ///   js  getTime()
        /// 
        ///   
        /// 
        public static Int64 JsGetTime(this DateTime dt)
        {
     
            Int64 retval = 0;
            var st = new DateTime(1970, 1, 1);
            TimeSpan t = (dt.ToUniversalTime() - st);
            retval = (Int64)(t.TotalMilliseconds + 0.5);
            return retval;
        }

        ///


        ///       1970-01-01
        /// 
        ///     
        /// 
        public static DateTime Default(this DateTime dt)
        {
     
            return DateTime.Parse("1970-01-01");
        }

        ///


        ///       （    ，  Linux    ）
        /// 
        ///     
        /// 
        public static DateTime ToCstTime(this DateTime dt)
        {
     
            Instant now = SystemClock.Instance.GetCurrentInstant();
            var shanghaiZone = DateTimeZoneProviders.Tzdb["Asia/Shanghai"];
            return now.InZone(shanghaiZone).ToDateTimeUnspecified();
        }

        ///


        ///       
        /// 
        ///   
        /// 
        public static DateTime ToLocalTime(this DateTime time)
        {
     
            return TimeZoneInfo.ConvertTime(time, TimeZoneInfo.Local);
        }

        ///


        ///      Unix     (    )
        /// 
        ///   
        /// 
        public static int ToUnixTimeStamp(this DateTime time)
        {
     
            DateTime startTime = new DateTime(1970, 1, 1).ToLocalTime();
            return (int)(time - startTime).TotalSeconds;
        }
    }
}

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