如何在c#中将字符串偏移量转换为时间跨度 [英] How to convert string offset to timespan in c#

问题描述

我正在尝试将转换时间转换为用户的时区，但我没有 Windows 时区字符串，例如太平洋标准时间".我所拥有的只是一个字符串偏移量，例如-07:00".看起来我需要创建一个时间跨度.是手动解析这个字符串的唯一方法吗?似乎应该有一种使用字符串偏移量转换时间的方法，但也许我遗漏了一些东西.

I'm trying to convert the convert time to the user's time zone, but I don't have the windows time zone string such as "Pacific Standard Time". All I have is a string offset such as "-07:00". Looks like I need to create a timespan. Is the only way to parse this string manually?. Seems like there should be a way to convert a time using a string offset, but maybe I am missing something.

我有这个，但它需要时区.我正在尝试修改它以使用偏移量，但您可以看到为转换创建的时间跨度，我需要将偏移量设置为时间跨度.

I have this but it requires the timezone. I'm trying to modify it to use the offset instead, but you can see the timespan that is created for the conversion and I need to get my offset to the timespan.

static void Main(string[] args)
{
    var currentTimeInPacificTime = ConvertUtcTimeToTimeZone(DateTime.UtcNow, "Pacific Standard Time");
    //TimeSpan ts = new TimeSpan("-07:00");
    Console.ReadKey();
}

static DateTimeOffset ConvertUtcTimeToTimeZone(DateTime dateTime, string toTimeZoneDesc)
{
    if (dateTime.Kind != DateTimeKind.Utc) throw new Exception("dateTime needs to have Kind property set to Utc");
    TimeSpan toUtcOffset = TimeZoneInfo.FindSystemTimeZoneById(toTimeZoneDesc).GetUtcOffset(dateTime);
    var convertedTime = DateTime.SpecifyKind(dateTime.Add(toUtcOffset), DateTimeKind.Unspecified);
    return new DateTimeOffset(convertedTime, toUtcOffset);
}

推荐答案

您只需使用 TimeSpan.Parse 方法:

You can just use the TimeSpan.Parse method:

TimeSpan ts = TimeSpan.Parse("-07:00");
Console.WriteLine(ts);   // -07:00:00

小心去掉前导的+"因为 TimeSpan.Parse 会在这里失败.+01:00"不正确，但01:00"有效.

Be careful to strip a leading "+" as TimeSpan.Parse will fail here. "+01:00" is incorrect, but "01:00" works.

或者，如果您想要更安全一点，请尝试TimeSpan.TryParse 方法:

Or if you want be a little more safe, try the TimeSpan.TryParse method:

TimeSpan ts;
if (TimeSpan.TryParse("-07:00", out ts))
    Console.WriteLine(ts);   // -07:00:00

当然，如果您只想将 UTC 日期/时间转换为本地日期/时间，您可以这样做:

But of course if all you want to do is convert a UTC date/time to a local date/time, you can just do this:

DateTime localDateTime = utcDateTime.ToLocalTime();

或将其转换为任何时区:

Or to convert it to any timezone:

TimeZoneInfo tzi = TimeZoneInfo.FindSystemTimeZoneById(toTimeZoneDesc);
DateTime localDateTime = TimeZoneInfo.ConvertTime(utcDateTime, tzi);

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