What is wrong with this date string? causing: "Unhandled Exception: System.FormatException"

I call my script like this:

>Driver.exe 26268 "01-01-2011" "02-01-2011"

arg 0 : c:\Services\JasperBatchService\Release\JasperBatchDriver.exe
arg 1 : 26268

Unhandled Exception: System.FormatException: String was not recognized as a valid DateTime.
   at System.DateTimeParse.ParseExact(String s, String format, DateTimeFormatInfo dtfi,  DateTimeStyles style)
   at Program.main(String[] args) in C:\sswork\dev\fSharpServices\ops-Projects\JasperBatchDriver\Program.fs:line 65

and this is the relavent code:

let mutable argNum = 0
let cmdArgs = System.Environment.GetCommandLineArgs()    

for arg in cmdArgs do
    match argNum with
    | 1 -> pmID      <- System.Int32.Parse arg 
    | 2 -> startDate <- DateTime.ParseExact(arg, "D", new CultureInfo("en-US"))
    | 3 -> endDate   <- DateTime.ParseExact(arg, "D", new CultureInfo("en-US"))
    | _ -> ()
    printfn "arg %d : %s" argNum arg
    argNum <- argNum + 1

i've also tried this:

for arg in cmdArgs do
    match argNum with
    | 1 -> pmID      <- System.Int32.Parse arg 
    | 2 -> startDate <- DateTime.ParseExact(arg, "MM-dd-yyyy", new CultureInfo(开发者_运维百科"en-US"))
    | 3 -> endDate   <- DateTime.ParseExact(arg, "MM-dd-yyyy", new CultureInfo("en-US"))
    | _ -> ()
    printfn "arg %d : %s" argNum arg
    argNum <- argNum + 1

and this:

for arg in cmdArgs do
    match argNum with
    | 1 -> pmID      <- System.Int32.Parse arg 
    | 2 -> startDate <- DateTime.ParseExact(arg, "MM/dd/yyyy", new CultureInfo("en-US"))
    | 3 -> endDate   <- DateTime.ParseExact(arg, "MM/dd/yyyy", new CultureInfo("en-US"))
    | _ -> ()
    printfn "arg %d : %s" argNum arg
    argNum <- argNum + 1

the closest it seems I came is by using this:

(startDate).ToString("MM/dd/yyyy")

this however added double-quotes to the output....

It looks like your calls to DateTime.ParseExact are expecting the "D" (Long Date pattern) format, which is different than what you're providing. If you plan on accepting arguments in the MM-DD-YYYY format, you'll need to use a custom format instead.

Try this:

DateTime.ParseExact(arg, "MM-dd-yyyy", new CultureInfo("en-US"))

this works (from fsi):

System.DateTime.ParseExact ("01-01-2011", "MM-dd-yyyy",
System.Globalization.CultureInfo "en-US");;
val it : System.DateTime = 1/1/2011 12:00:00 AM {Date = 1/1/2011 12:00:00 AM;
                                             Day = 1;
                                             DayOfWeek = Saturday;
                                             DayOfYear = 1;
                                             Hour = 0;
                                             Kind = Unspecified;
                                             Millisecond = 0;
                                             Minute = 0;
                                             Month = 1;
                                             Second = 0;
                                             Ticks = 634294368000000000L;
                                             TimeOfDay = 00:00:00;
                                             Year = 2011;}

how are you iterating through the args array? isn't the mutable argNum always 0?

arg 2 should be in this format 01-01-2011