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fun confrontoDate(data1:String,data2:String): String
{
    var esito = ""
    var errore = false
    val sdf0 = SimpleDateFormat("yyyy-MM-dd")
    var data1format = formattaData(data1)
    var data2format = formattaData(data2)
    var data1GC = GregorianCalendar()
    var data2GC = GregorianCalendar()

    try {
        data1GC.setTime(sdf0.parse(data1format))
    } catch (e:Exception) {
        errore = true
    }
    //
    try {
        data2GC.setTime(sdf0.parse(data2format))
    } catch (e:Exception) {
        errore = true
    }
    if (!errore) {
        if (data1GC.before(data2GC)) esito = data1 + " ante " + data2
        if (data1GC.after(data2GC)) esito = data1 + " post " + data2
        if (data1GC.equals(data2GC)) esito = data1 + " = " + data2
    }
    else
        esito = "dati errati " +data1 +"/"+ data2

    return esito
}