System.FormatException：字符串未被识别为有效的日期时间 - 尝试转换 MM/DD/YYYY 时

Question

I have following C# method:

DateTime ConvertStringToDate(string dateInString)
{
    try {
        //string SSD = dateInString;
        //DateTime date = Convert.ToDateTime(SSD);
        //string strDate = String.Format("{0:yyyy-MM-dd HH:mm:ss.fff}", date);
        //return Convert.ToDateTime(strDate);

        return DateTime.ParseExact(dateInString, "MM/dd/yyyy", CultureInfo.InvariantCulture);
    }
    catch (Exception) { }
    return DateTime.Today;
} 

The code in comment is another way I tried before.

I am in India and developing an ASP.NET WebForms application for my client in US. On one of its forms my client will enter the date in TextBox like 6/20/2018 which is MM/dd/yyyy format.

But in both the ways I am getting this error: System.FormatException: 'String was not recognized as a valid DateTime.'

I tried many solutions on SO but none of them are working.

Answer 1

return DateTime.ParseExact(dateInString, "M/d/yyyy", CultureInfo.InvariantCulture);

Check it here

The difference between my answer and Fabulous' one is that I also shortened dd to d so if your user writes 6/6/2018 it will work too

Answer 2

Your date format is MM/dd/yyyy and your input doesn't match. It is M/dd/yyyy

Based on your comment, to solve the 6/1/2018 issue, you'll need to do it as follows M/d/yyyy

Answer 3

Your format string is missing the AM/PM deisgnator:

return DateTime.ParseExact
    (dateInString + " 12:00:00 AM", "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);
    // Here ---------------------------------------------^

Answer 4

尝试不与字符串“ AM”串联

Answer 5

I was getting the same exception a couple of days ago when it was 9th of July, I simply appended a 0 with 9 to match the date format.

Try appending a 0 in your month to match the MM in your date format

Answer 6

Sometimes your system time and date format is not same as test format you can try to change system date and time format

Answer 7

If you want to convert this (01-01-2022) type of string into date then try below code.

DateTime date = DateTime.ParseExact("01-01-2022", "MM-dd-yyyy", CultureInfo.InvariantCulture);

If you want to convert this (01/01/2022) type of string into date then try below code.

DateTime date = DateTime.ParseExact("01-01-2022", "MM/dd/yyyy", CultureInfo.InvariantCulture);