输入字符串格式不正确无法解析为DateTime

Question

I am facing problem while converting DataTime into Time on 12 hour clock machine. Following code works fine on 24 Hour clock machine.

(new DisplayReminder(_name, _displayText, _snoozTime, TimeSpan.Parse(_startTime.ToShortTimeString(), CultureInfo.InvariantCulture))).Show();

TimeSpan.Parse(_startTime.ToShortTimeString() throws exeception that input string not in correct format, here I am trying to get time part from DateTime value _startDate Any suggestion or solution on this problem.

Answer 1

It's not clear what you're trying to do, but just getting the time of day shouldn't involve string conversions:

TimeSpan time = _stateTime.TimeOfDay;

I'd strongly advise you to avoid string conversions unless they're inherently part of what you're trying to achieve.

Personally I don't like using TimeSpan as a time of day anyway, but that's the BCL for you. You might want to also look into my Noda Time library which has a clearer separation of various date/time concepts.

Answer 2

Try this:

TimeSpan.ParseExact(
         _startTime.ToString("hh:mm:ss"), "hh:mm:ss",
                          System.Globalization.CultureInfo.InvariantCulture);

it will format your date to same format as TimeSpan.ParseExact accepts, so it will run on any machine (I assume that _startTime is DateTime )

Answer 3

尝试

startTime.TimeOfDay.ToString()

Answer 4

I am pretty sure that it works fine when 24H but crushes in 12H system, BECAUSE of the "PM" "AM" part ! get rid of it you'll be safe 11:54:33 PM and 23:54:33 are VERY different in terms of handling

EDIT it might be not the best solution but it works if you cut the last indexes of the string:

    int index = _StartTime.IndexOf("M");
    if (index >= 0) 
{
_StartTime = _StartTime.Substring(0, index-1);
switch (_StartTime.IndexOf("P"))
case : -1
 _StartTime = _StartTime.Substring(0,_StartTime.Length);
 break;

default:
 string hours = _startTime.Substring(_StartTime.Length-8,2);
 int H = Convert.ToInt32(hours);
 H += 12;
 string result = _StartTime.Substring(0, _StartTime.Length-8)+ Convert.ToString(H)+_startTime.Substring(_StartTime.Length-6);

_StartTime = result;
break;
}

this will throw AM/PM away, you can use the same previous code after this SECOND EDIT it's the most horrible solution but it works ;)