问题描述
我正在尝试将毫秒转换为 UTC 日期时间。我已经设法将毫秒转换为本地日期时间,但无法将本地日期时间转换为 UTC 日期时间。当我使用 DateTimeOffset 时,我落后了一小时,所以我相信这是本地 DateTime?
我无法将本地时间转换为 UTC DateTime
测试类
[Fact]
public void DateTimeCalculation_MustTakeDateTimeParameter_InMilliSecond()
{
//Arrange
long startDateTimeUtc = 1626987600000; //2021-07-22 22:00:00
//Act
DateTimeOffset calculatedTimeOffset = DateTimeCalculationHelper.DateTimeCalculation(startDateTimeUtc);
var utcDateTime = calculatedTimeOffset.UtcDateTime.ToString(); //not working
var t1 = calculatedTimeOffset.ToUniversalTime(); //not working
//Assert
string actual = calculatedTimeOffset.ToString();
string expected = "22/07/2021 10:00:00 PM +00:00";
Assert.Equal(expected,actual);
}
将DateTime转换为毫秒的静态类
public static class DateTimeCalculationHelper
{
public static DateTimeOffset DateTimeCalculation(long milSec)
{
DateTimeOffset epochTime = new DateTimeOffset(1970,1,TimeSpan.Zero);
return epochTime.AddMilliseconds(milSec);
}
}
解决方法
var longDate = new DateTime(132713856000000000);//{7/22/0421 12:00:00 AM}
var dateNow = new DateTime(2021,07,22);//{7/22/2021 12:00:00 AM}
var dateNowUTC = dateNow.ToFileTimeUtc();//132713856000000000
var utcDate = DateTime.SpecifyKind(dateNow,DateTimeKind.Utc).ToString("U");//"Thursday,July 22,2021 12:00:00 AM"