Código:
Gracias!! function check_date(field){ var checkstr = "0123456789"; var DateField = field; var Datevalue = ""; var DateTemp = ""; var seperator = "/"; var day; var month; var year; var leap = 0; var err = 0; var i; err = 0; DateValue = DateField.value; /* Delete all chars except 0..9 */ for (i = 0; i < DateValue.length; i++) { if (checkstr.indexOf(DateValue.substr(i,1)) >= 0) { DateTemp = DateTemp + DateValue.substr(i,1); } } DateValue = DateTemp; /* Always change date to 8 digits - string*/ /* if year is entered as 2-digit / always assume 20xx */ if (DateValue.length == 6) { DateValue = DateValue.substr(0,4) + '20' + DateValue.substr(4,2); } if (DateValue.length != 8) { err = 19;} /* year is wrong if year = 0000 */ year = DateValue.substr(4,4); if (year == 0) { err = 20; } /* Validation of month*/ month = DateValue.substr(2,2); if ((month < 1) || (month > 12)) { err = 21; } /* Validation of day*/ day = DateValue.substr(0,2); if (day < 1) { err = 22; } /* Validation leap-year / february / day */ if ((year % 4 == 0) || (year % 100 == 0) || (year % 400 == 0)) { leap = 1; } if ((month == 2) && (leap == 1) && (day > 29)) { err = 23; } if ((month == 2) && (leap != 1) && (day > 28)) { err = 24; } /* Validation of other months */ if ((day > 31) && ((month == "01") || (month == "03") || (month == "05") || (month == "07") || (month == "08") || (month == "10") || (month == "12"))) { err = 25; } if ((day > 30) && ((month == "04") || (month == "06") || (month == "09") || (month == "11"))) { err = 26; } /* if 00 ist entered, no error, deleting the entry */ if ((day == 0) && (month == 0) && (year == 00)) { err = 0; day = ""; month = ""; year = ""; seperator = ""; } /* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */ if (err == 0) { DateField.value = day + seperator + month + seperator + year; } /* Error-message if err != 0 */ else { alert("¡La fecha ingresada es incorrecta! (dd/mm/aaaa)"); DateField.select(); DateField.focus(); } }