src/SSCMS.Core/Utils/DateUtils.cs

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using System;
using System.Globalization;
using SSCMS.Configuration;
using SSCMS.Enums;
using SSCMS.Utils;

namespace SSCMS.Core.Utils
{
	public static class DateUtils
	{
        public const string FormatStringDateTime = "yyyy-MM-dd HH:mm:ss";
        public const string FormatStringDateOnly = "yyyy-MM-dd";
        private static readonly DateTime JanFirst1970 = new DateTime(1970, 1, 1);

        public static int GetUnixTimestamp(DateTime dateTime)
        {
            return (int)dateTime.Subtract(JanFirst1970).TotalSeconds;
        }

        public static DateTime GetExpiresAt(TimeSpan expiresAt)
	    {
	        return DateTime.UtcNow.Add(expiresAt);
	    }

        public static string GetRelatedDateTimeString(DateTime datetime)
        {
            string retrieval;
            var interval = DateTime.Now - datetime;
            if (interval.Days > 0)
            {
                if (interval.Days >= 7 && interval.Days < 35)
                {
                    retrieval = $"{interval.Days/7}周";
                }
                else
                {
                    retrieval = $"{interval.Days}天";
                }
            }
            else if (interval.Hours > 0)
            {
                retrieval = $"{interval.Hours}小时";
            }
            else if (interval.Minutes > 0)
            {
                retrieval = $"{interval.Minutes}分钟";
            }
            else if (interval.Seconds > 0)
            {
                retrieval = $"{interval.Seconds}秒";
            }
            else if (interval.Milliseconds > 0)
            {
                retrieval = $"{interval.Milliseconds}毫秒";
            }
            else
            {
                retrieval = "1毫秒";
            }
            return retrieval;