DateTime.Now returning the same time several times in a row

Question

I'm appending text to an existing TXT file and one of the fields I'm recording the date and time, which are passed to a StreamWriter. The issue I'm having is that using the script a few times in a row is causing the record to come up with the same date and time.

Below is a snippet of what I'm getting as a result and my class just below. Any help would be very much appreciated.

14/09/2021 8:42:54 PM, nflab, ScriptName, C:\Documents\filename.rvt, 1500
14/09/2021 8:42:54 PM, nflab, ScriptName, C:\Documents\filename.rvt, 1500
14/09/2021 8:42:54 PM, nflab, ScriptName, C:\Documents\filename.rvt, 1500
14/09/2021 8:42:54 PM, nflab, ScriptName, C:\Documents\filename.rvt, 1500
14/09/2021 9:08:21 PM, nflab, ScriptName, C:\Documents\filename.rvt, 1500
14/09/2021 9:08:21 PM, nflab, ScriptName, C:\Documents\filename.rvt, 1500

public static class Usage
{
    readonly static DateTime dateTime = DateTime.Now;
    readonly static string filename = "ScriptUsageLog_";
    readonly static string userName = System.Environment.UserName;
    readonly static string fileExtension = ".txt";
    static string path;

    public static void Log(Document doc, string scriptName, int timeSavings = 0)
    {
        path = doc.PathName;

        using (StreamWriter fileAppend = File.AppendText(FileLocations.UsageFolder +
                                                                       filename +
                                                                       userName +
                                                                       fileExtension))
        {
            fileAppend.WriteLine($"{dateTime}, {userName}, {scriptName}, {path}, {timeSavings}");
            fileAppend.Close();
        }
    }
}

Answer 1

You're using the global variable datetime. This value is set once time when your application started.

fileAppend.WriteLine($"{dateTime}, {userName}, {scriptName}, {path}, {timeSavings}");

You should update it to

fileAppend.WriteLine($"{DateTime.Now}, {userName}, {scriptName}, {path}, {timeSavings}");