如何计算 2 个系统时间与一个来自字符串的系统时间之间的差异

Question

我正在尝试计算两次之间的秒数。有 1 个时间值来自我的数据库中的字符串，我尝试在 Unity 中将其转换为 System.DateTime 但没有成功。

这是来自数据库的字符串：3-5-2022 10:20:45

public string starttime = "3-5-2022 10:20:45";

public void StakingProfitCheck()
{
    StartCoroutine(StakingCheck());
}

IEnumerator StakingCheck()
{
    WWW pwww = new WWW("DatabasePage");
    yield return new WaitForSeconds(0.2f);
    yield return pwww;
    starttime = pwww.text;
    Timecalculator();
}

void Timecalculator()
{
    System.TimeSpan ts = System.DateTime.UtcNow - Convert.ToDateTime(starttime);
    Debug.Log (ts.Seconds.ToString());
}

出现此错误：

FormatException: String was not recognized as a valid DateTime. System.DateTimeParse.Parse (System.ReadOnlySpan`1[T] s, System.Globalization.DateTimeFormatInfo dtfi, System.Globalization.DateTimeStyles styles) (at :0) System.DateTime.Parse (System.String s, System.IFormatProvider provider) (at :0) System.Convert.ToDateTime (System.String value) (at :0) StakingMenuScript.Timecalculator (System.String StartTime) (at Assets/Scripts/StakingMenuScript.cs:54) StakingMenuScript+d__5.MoveNext () (at Assets/Scripts/StakingMenuScript.cs:50) UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at <13e6546058e340ada820e34dce3b245e>:0)

如何计算以秒为单位的时差？？？

Answer 1

您的问题是解析日期不正确。

您可以使用 DateTime.Parse。假设您的格式是德语，您的代码应该如下所示。

private void Timecalculator(string startTime)
{
    var start = DateTime.Parse(startTime, new CultureInfo("de-DE"), DateTimeStyles.None);
    var difference = DateTime.UtcNow.Subtract(start);
}

Answer 2

您以不恰当的方式解析日期。您可以尝试使用 ParseExact 和您期望的 string 日期格式。

var dateString = "3-5-2022 10:20:45";
var format = "d-M-yyyy HH:mm:ss";
var result = DateTime.ParseExact(dateString, format, CultureInfo.InvariantCulture);
Console.WriteLine("{0} converts to {1}.", dateString, result.ToString());

https://docs.microsoft.com/pl-pl/dotnet/api/system.datetime.parseexact?view=net-6.0

要获取时差，您可以使用以下语法：

System.TimeSpan diff = secondDate.Subtract(firstDate);

如何计算 2 个系统时间与一个来自字符串的系统时间之间的差异

how to Calculate the differents between 2 system times with one from string

c#

datetime

unity3d