Support › General › Saving Dates In Another Format
this from your DOCS
'js_options' => array(
'dateFormat' => 'dd-mm-yy',
'save_format' => 'Y-m-d',
doesn't work. The date is display in format "Y-m-d".
PHP (5.4), Metabox (4.16.3)
I've just tested the code and it works. As you can see in this screenshot, the date appearing in the input is 20-02-2019, but its value in the custom field is 2019-02-20:
Can you please try again?
now it is working.. Thanks for your time.