System.FormatException: String was not recognized as a valid DateTime. at System.DateTimeParse.Parse(String s, DateTimeFormatInfo dtfi, DateTimeStyles styles) at System.Convert.ToDateTime(String value)

Question

hello,

The application VB get system date convert to string and put it in DateTimeParse.Parse(String s, DateTimeFormatInfo dtfi, DateTimeStyles styles) , System.Convert.ToDateTime(String value) to convert the new string to date that throw exception in some windows 8.1 and 10 machine but
in certain machine this work without prolbème.

the application runs on netframwork 4.8.

Anyone can hlep me

Answer 1

Hi,
you can reproduce error with following code:

    string s = "";
    var res = System.Convert.ToDateTime(s);
    Console.WriteLine(res);

variable "s" contains string not convertible to date.

Use TryParse instead:

    string s = "";
    DateTime d;
    if (System.DateTime.TryParse(s, out d))
      Console.WriteLine(d);
    else
      Console.WriteLine("invalid date string");