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Date starttimesampTime new Date(Long.parseLong(startTimestamp)) Long epoch starttimesampTime.getTime() / 1000 However, I am getting the following exception. using System Ĭonsole.WriteLine($"Unable to parse '", ++numVal) Ĭonsole.WriteLine("numVal cannot be incremented beyond its current value") Ĭonsole.WriteLine("Input string is not a sequence of digits.") Ĭonsole.WriteLine("The number cannot fit in an Int32. I have a string startTimestamp which is a string, and I am trying to convert it to a epoch time as follows.

The following example demonstrates both successful and unsuccessful calls to Parse and TryParse. You can check for a null or empty string before attempting to parse it by calling the String.IsNullOrEmpty method. A string whose value is null or String.Empty fails to parse successfully. 3" (note the embedded space), "10e1" ( float.TryParse works here), and so on. Please search StackOverflow before posting. possible duplicate of Convert Date string with Time to long date Basil Bourque. For example, you can use decimal.TryParse to parse "10", "10.3", or " 10 ", but you can't use this method to parse 10 from "10X", "1 0" (note the embedded space), "10. Ask Question Asked 8 years, 9 months ago. Any white space within the string that forms the number causes an error. 3.(yourString) will determine if the string can be parsed by one of: Integer.parseInt(String), Long.parseLong(String), Float.parseFloat(String) or Double. The Parse and TryParse methods ignore white space at the beginning and at the end of the string, but all other characters must be characters that form the appropriate numeric type ( int, long, ulong, float, decimal, and so on). When calling a Parse method, you should always use exception handling to catch a FormatException when the parse operation fails. If the string isn't in a valid format, Parse throws an exception, but TryParse returns false. The Parse method returns the converted number the TryParse method returns a boolean value that indicates whether the conversion succeeded, and returns the converted number in an out parameter. The Convert.ToInt32 method uses Parse internally. You use Parse or TryParse methods on the numeric type you expect the string contains, such as the System.Int32 type. while ( matcher.find () ) size++ and then with size create a long of size size and do a: matcher.reset () and now save the long values in the long variable. Another way would be: First count every occurrence with a. Using a Convert method is more useful for general objects that implement IConvertible. At the end I create a long with the size of the arrayList and do a for each to add it to the long var. It's slightly more efficient and straightforward to call a TryParse method (for example, int.TryParse("11", out number)) or Parse method (for example, var number = int.Parse("11")). You convert a string to a number by calling the Parse or TryParse method found on numeric types ( int, long, double, and so on), or by using methods in the System.Convert class.