Retrieve date format and parse if needed in PHP - php

Question

I've created this function when retrieving a date from database and echo in Italian format to screen:
function get_data_ita($date) {
if ($date == "")
return "";
$d = new DateTime($date);
return $d->format('d/m/Y');
}
where $date is mysql format like: 2017-12-31 14:00:00
Now, if I pass a correct format like: 2017-12-31 14:00:00 the function works.
But sometimes I need to use the SAME function, passing an already formatted date like: 30/12/2017. In this case, i get parsing error of course.
How can I check if date passed is already in Italian format, and if yes return the untouched date, if not, parse the date?
I need a function like:
function get_data_ita($date) {
if ( $date== ALREADY_IN_ITALIAN_FORMAT )
return $date;
if ($date == "")
return "";
$d = new DateTime($date);
return $d->format('d/m/Y');
}
echo get_data_ita("30/12/2017");
echo get_data_ita("2017-12-31 14:00:00");
ECHO:
30/12/2017
31/12/2017
UPDATE: I found solution myself:
function validateDate($date, $format = 'Y-m-d')
{
$d = DateTime::createFromFormat($format, $date);
return $d && $d->format($format) == $date;
}
function get_data_ita($datetime_db) {
if ( validateDate($datetime_db, 'd/m/Y') ) {
return $datetime_db;
}
if ($datetime_db == "")
return "";
$date = new DateTime($datetime_db);
return $date->format('d/m/Y');
}

Answer 1

Replace / to -
<?php
function get_data_ita($date) {
if ($date == ""){
return "";
}
$date = str_replace('/','-',$date);
$d = new DateTime($date);
return $d->format('d/m/Y');
}
echo get_data_ita("30/12/2017");
echo "\n";
echo get_data_ita("2017-12-31 14:00:00");
?>
Check demo : https://eval.in/918149

Answer 2

Strtotime returns false if the date is not a valid date format.
This works for your inputs but not if there are other date formats.
function get_data_ita($date) {
if ($date == "") return "";
If(strtotime($date) !== False){
$d = new DateTime($date);
}Else{
$d = DateTime::createFromFormat('d/m/Y', $date);
}
return $d->format('d/m/Y');
}
echo get_data_ita("30/12/2017");
echo get_data_ita("2017-12-31 14:00:00");
https://3v4l.org/kt5Vg