如何将毫秒中的时间字符串转换为c＃中的DateTime对象？

Question

I have the time in milliseconds as a string like this: 229935440730121 How to convert this string to a DateTime object.
Thanks

Update

Sorry, The correct string is : 1423509923000 and should be 2/9/15 7:25:23 PM after conversion. It's a time string received from an telemetry device.

Answer 1

Milliseconds is a duration , not a time . You can convert it to a TimeSpan easily:

string ms = "229935440730121";
TimeSpan ts = TimeSpan.FromMilliseconds(double.Parse(ms));

To convert to a DateTime you need to know the reference point from which the span was measured, then just add the TimeSpan to that date:

DateTime dt = DateTime.MinValue;  // for example only
dt += ts;  // add the timespan to the date

In your example, that number of milliseconds represents over 7,280 years , so it's not clear what the reference point should be.