如何在c#中将毫秒格式转换为日期格式

本文关键字：格式 转换 日期 | 更新日期: 2023-09-27 18:07:57

在c#中如何将unix风格的时间戳转换为yyyy-MM-ddThh:mm:ssZ?

如何在c#中将毫秒格式转换为日期格式

首先将毫秒转换为TimeSpan:

var time = TimeSpan.FromMilliseconds(milliseconds);

现在，在。net 4中，您可以使用格式字符串参数调用.ToString()。见http://msdn.microsoft.com/en-us/library/system.timespan.tostring.aspx

在以前的。net版本中，您必须从TimeSpan的属性中手动构造格式化字符串。

new DateTime(numTicks * 10000)

DateTime(长刻度)构造函数是您需要的。每个刻度代表100纳秒，所以乘以10000得到1毫秒。

如果毫秒是基于UNIX纪元时间的，那么您可以使用:

var posixTime = DateTime.SpecifyKind(new DateTime(1970, 1, 1), DateTimeKind.Utc);
var time = posixTime.AddMilliseconds(milliSecs);

这对我有用:

DateTimeOffset.FromUnixTimeMilliseconds(milliseconds);

如果你需要的话，你可以从中获取DateTime

给你:

public static class UnixDateTime
    {
        public static DateTimeOffset FromUnixTimeSeconds(long seconds)
        {
            if (seconds < -62135596800L || seconds > 253402300799L)
                throw new ArgumentOutOfRangeException("seconds", seconds, "");
            return new DateTimeOffset(seconds * 10000000L + 621355968000000000L, TimeSpan.Zero);
        }
        public static DateTimeOffset FromUnixTimeMilliseconds(long milliseconds)
        {
            if (milliseconds < -62135596800000L || milliseconds > 253402300799999L)
                throw new ArgumentOutOfRangeException("milliseconds", milliseconds, "");
            return new DateTimeOffset(milliseconds * 10000L + 621355968000000000L, TimeSpan.Zero);
        }
        public static long ToUnixTimeSeconds(this DateTimeOffset utcDateTime)
        {
            return utcDateTime.Ticks / 10000000L - 62135596800L;
        }
        public static long ToUnixTimeMilliseconds(this DateTimeOffset utcDateTime)
        {
            return utcDateTime.Ticks / 10000L - 62135596800000L;
        }
        [Test]
        public void UnixSeconds()
        {
            DateTime utcNow = DateTime.UtcNow;
            DateTimeOffset utcNowOffset = new DateTimeOffset(utcNow);
            long unixTimestampInSeconds = utcNowOffset.ToUnixTimeSeconds();
            DateTimeOffset utcNowOffsetTest = UnixDateTime.FromUnixTimeSeconds(unixTimestampInSeconds);
            Assert.AreEqual(utcNowOffset.Year, utcNowOffsetTest.Year);
            Assert.AreEqual(utcNowOffset.Month, utcNowOffsetTest.Month);
            Assert.AreEqual(utcNowOffset.Date, utcNowOffsetTest.Date);
            Assert.AreEqual(utcNowOffset.Hour, utcNowOffsetTest.Hour);
            Assert.AreEqual(utcNowOffset.Minute, utcNowOffsetTest.Minute);
            Assert.AreEqual(utcNowOffset.Second, utcNowOffsetTest.Second);
        }
        [Test]
        public void UnixMilliseconds()
        {
            DateTime utcNow = DateTime.UtcNow;
            DateTimeOffset utcNowOffset = new DateTimeOffset(utcNow);
            long unixTimestampInMilliseconds = utcNowOffset.ToUnixTimeMilliseconds();
            DateTimeOffset utcNowOffsetTest = UnixDateTime.FromUnixTimeMilliseconds(unixTimestampInMilliseconds);
            Assert.AreEqual(utcNowOffset.Year, utcNowOffsetTest.Year);
            Assert.AreEqual(utcNowOffset.Month, utcNowOffsetTest.Month);
            Assert.AreEqual(utcNowOffset.Date, utcNowOffsetTest.Date);
            Assert.AreEqual(utcNowOffset.Hour, utcNowOffsetTest.Hour);
            Assert.AreEqual(utcNowOffset.Minute, utcNowOffsetTest.Minute);
            Assert.AreEqual(utcNowOffset.Second, utcNowOffsetTest.Second);
            Assert.AreEqual(utcNowOffset.Millisecond, utcNowOffsetTest.Millisecond);
        }
    }

这个示例将演示总体思路，但是您需要知道起始日期是否为DateTime。最小值或其他值:

int ms = 1000;                          // One second
var date = new DateTime(ms * 10000);    // The constructor takes number of 100-nanoseconds ticks since DateTime.MinValue (midnight, january 1st, year 1)
string formatted = date.ToString("yyyy-MM-ddTHH:mm:ssZ");
Console.WriteLine(formatted);

你可以用刻度来构造你的日期时间:

long ticks = new DateTime(1979, 07, 28, 22, 35, 5, 
  new CultureInfo("en-US", false).Calendar).Ticks;
DateTime dt3 = new DateTime(ticks);
Console.Write(dt3.ToString("yyyy-MM-ddThh:mm:ssZ"));

    private static DateTime Milliseconds2Date(Double d)
    {         
        TimeSpan time = TimeSpan.FromMilliseconds(d);
        return new DateTime(1970, 1, 1) + time;
    }
    private static Double Date2Milliseconds(DateTime d)
    {
        var t = d.Subtract(new DateTime(1970, 1, 1));
        return t.TotalMilliseconds;            
    }

这个问题应该有你需要的答案。

短版:

DateTime date = new DateTime(long.Parse(ticks));
date.ToString("yyyy-MM-ddThh:mm:ssZ");

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