Trouble with time wave

#pragma rtGlobals=3     // Use modern global access method and strict wave access.

Menu "Weather"
    "Load Weather Data...", LoadWeatherFiles("")
End

// HR:
// AMPMTimeAdjustment(theTime, flag)
// Returns the necessary adjustment in seconds to convert a time from AM/PM representation
// to 24 hour representation.
Function AMPMTimeAdjustment(theTime, flag)
    Variable theTime
    String flag                 // Must be either "a" or "p"
   
    Variable adjustment = 0
    Variable secondsIn12Hours = 43200
   
    if (CmpStr(flag, "a") == 0)
        // AM: If the hour is 12:xx, subtract seconds in 12 hours
        if (theTime >= secondsIn12Hours)
            adjustment = -secondsIn12Hours
        endif
    else
        // PM: Adds 12 hours unless hour is 12:xx.
        if (theTime < secondsIn12Hours)
            adjustment = secondsIn12Hours
        endif
    endif

    return adjustment
End

Function LoadWeatherFile(pathName, fileName, makeTable)
    String pathName     // Name of an Igor symbolic path or "".
    String fileName         // Name of file or full path to file.
    Variable makeTable      // 1 to make table, 0 to not make table
 
    // First get a valid reference to a file.
    if ((strlen(pathName)==0) || (strlen(fileName)==0))
        // Display dialog looking for file.
        Variable refNum
        Open/D/R/F="*.txt"/P=$pathName refNum as fileName
        fileName = S_fileName           // S_fileName is set by Open/D
        if (strlen(fileName) == 0)      // User cancelled?
            return -1
        endif
    endif
 
    // Now load the data. The /V flag specifies the accepted delimiters in the data file.
    // Add the /A flag if you don't want the "Loading Delimited Text" dialog.
    // Add the /O flag if you want to overwrite existing waves with the same names.
 
    // "Date" and "Time" are not available as wave names because they are Igor function names
    String columnInfoStr = " "
        columnInfoStr += "N='MET_TimeW',T=4;"
        columnInfoStr += "N='TimeW',F=7;"
        columnInfoStr += "N='AMPM',F=-2;"           // HR: Load "a" or "p" after time into text wave
        columnInfoStr += "N='Temp_C';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='Hum_Per';"
        columnInfoStr += "N='Dew_Pt_C';"
        columnInfoStr += "N='Wind_Speed';"
        columnInfoStr += "N='Wind_Dir',F=-2;"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='Wind_Chill_C';"
        columnInfoStr += "N='Heat_Index_C';"
        columnInfoStr += "N='THW_Index_C';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='Press_Bar';"
        columnInfoStr += "N='Precip_Inch';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
        columnInfoStr += "N='_skip_';"
    String delimiters = "\t,"                       // Tab and comma-delimited
    delimiters += " "                               // HR: Add space - needed to load "a" and "p" into text wave
    String skipChars = "\" "                        // Skip quotes around date and time and spaces before commas
    LoadWave /J /L={0,2,0,0,0}/D/N /K=0 /V={delimiters,skipChars,0,0} /B=columnInfoStr /R={English, 1, 2, 1, 1, "Month/DayofMonth/Year", 40} /P=$pathName fileName
    Variable numWavesLoaded = V_flag            // V_flag is set by LoadWave
    if (numWavesLoaded != 13)                   // HR: 13 because of AMPM wave
        Print "Error loading file - wrong number of waves loaded"
        return -1
    endif
 
    // Create reference to waves created by LoadWave
    Wave MET_TimeW,TimeW

    // HR: Account for "a" for AM, "p" for PM
    // Add 12 hours where we have "p" unless hour is 12:xx
    // Subtract 12 hours where we have "a" if hour is 12:xx
    Wave/T AMPM
    TimeW += AMPMTimeAdjustment(TimeW, AMPM)
    KillWaves/Z AMPM                    // This is no longer needed
 
    MET_timew += TimeW              // Add time to date to obtain date/time
    KillWaves/Z TimeW                   // This is no longer needed
    return 0                            // Success
End
 
Function ConcatenateWeatherFile(pathName, fileName)
    String pathName
    String fileName
 
    // Create a new data folder
    NewDataFolder/O/S WeatherTemp
 
    Variable result = LoadWeatherFile(pathName, fileName, 0)
 
    SetDataFolder ::        // Back to original data folder
 
    if (result != 0)
        return result   // Error loading new waves
    endif
 
    // Concatenate new waves onto old
    Concatenate/NP {:WeatherTemp:MET_TimeW},MET_TimeW
    Concatenate/NP {:WeatherTemp:Temp_C},Temp_C
    Concatenate/NP {:WeatherTemp:Hum_Per},Hum_Per
    Concatenate/NP {:WeatherTemp:Dew_Pt_C},Dew_Pt_C
    Concatenate/NP {:WeatherTemp:Wind_Speed},Wind_Speed
    Concatenate/NP {:WeatherTemp:Wind_Dir},Wind_Dir
    Concatenate/NP {:WeatherTemp:Wind_Chill_C},Wind_Chill_C
    Concatenate/NP {:WeatherTemp:Heat_Index_C},Heat_Index_C
    Concatenate/NP {:WeatherTemp:THW_Index_C},THW_Index_C
    Concatenate/NP {:WeatherTemp:Press_Bar},Press_Bar
    Concatenate/NP {:WeatherTemp:Precip_Inch},Precip_Inch

   
    // Kill temp data folder
    KillDataFolder/Z :WeatherTemp
 
    return 0            // Success
End

Function LoadWeatherFiles(pathName)
    String pathName         // Name of symbolic path or "" to get dialog
    String fileName
    Variable index=0

    if (strlen(pathName)==0)            // If no path specified, create one
        NewPath/O temporaryPath         // This will put up a dialog
        if (V_flag != 0)
            return -1                       // User cancelled
        endif
        pathName = "temporaryPath"
    endif

    Variable result
    do          // Loop through each file in folder
        fileName = IndexedFile($pathName, index, ".txt")
        if (strlen(fileName) == 0)          // No more files?
            break                                   // Break out of loop
        endif
        result = ConcatenateWeatherFile(pathName, fileName)
        if (result == 0)                            // Did LoadAndGraph succeed?
                                                    // Print the graph.
            fileName = WinName(0, 1)                // Get the name of the top graph
            //String cmd
            //sprintf cmd, "PrintGraphs %s", fileName
            //Execute cmd                       // Explained below.

            //DoWindow/K $fileName          // Kill the graph
            //KillWaves/A/Z                 // Kill all unused waves
        endif
        index += 1
    while (1)

    if (Exists("temporaryPath"))            // Kill temp path if it exists
        KillPath temporaryPath
    endif
       
        Wave MET_TimeW,TimeW,Temp_C,Hum_Per,Dew_Pt_C,Wind_Speed,Wind_Dir,Wind_Chill_C,Heat_Index_C,THW_Index_C,Press_Bar,Precip_Inch
        Edit MET_TimeW,Temp_C,Hum_Per,Dew_Pt_C,Wind_Speed,Wind_Dir,Wind_Chill_C,Heat_Index_C,THW_Index_C,Press_Bar,Precip_Inch
        ModifyTable format(MET_TimeW)=8, width(MET_TimeW)=150
        Sort MET_TimeW Temp_C,Hum_Per,Dew_Pt_C,Wind_Speed,Wind_Dir;DelayUpdate
        Sort MET_TimeW Wind_Chill_C,Heat_Index_C,THW_Index_C,Press_Bar,Precip_Inch
        Sort MET_TimeW MET_TimeW
        DoWindow/K Weather
        DoWindow/C/T Weather,"Weather Data"

    return 0                        // Signifies success.
End