See the earliest F# file you have written

GetEarliestFSharpFileModifiedDate.fsx

open System.IO

let sourceDir = [ __SOURCE_DIRECTORY__ ]

let getFiles searchPattern dir  =
    seq {
        yield! Directory.EnumerateFiles(dir, searchPattern)
    }

let log x =
    printfn "%A" x
    x

// http://www.fssnip.net/pi/title/Recursively-find-all-files-from-a-sequence-of-directories
let rec getAllFiles f dirs =
    if Seq.isEmpty dirs then Seq.empty else
        seq { yield! dirs |> Seq.collect f
              yield! dirs
                     |> Seq.collect Directory.EnumerateDirectories
                     |> Seq.filter (fun x ->
                            let dirName = Path.GetFileName x
                            [ "node_modules"; ".git"; "bin"; "obj"; "vendors"; "themes"; "packages"; "VisualStudio2010" ]
                            |> List.contains dirName
                            |> not )
                     |> fun x -> if Seq.isEmpty x then Seq.empty else (getAllFiles f x) }

let getFileDates () =
    let FSharp = getFiles "*.fs?"
    getAllFiles FSharp sourceDir
    |> Seq.map (fun x ->
        let creationTime = File.GetLastWriteTime x
        x, creationTime
        )
    |> Seq.toArray

do
    getFileDates ()
    |> Seq.minBy ( fun (filename, date) -> date )
    |> (printfn "%A")