The Odoo 19 Datepicker format default is MMM d. It could have been better left as MM/dd/YYYY.
Changing the date format is desperating
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Hello,
Go to settings >>> Translations >>> Languages 
Where can I get that javascript override to change the datepicker format? I prefer to have it in MM/dd/YYYY because in the report during the printing, old documents will not show the date. (I can create a computed field though but takes extra coding).
In the Philippines, the government requires that invoices will have full dates. An invoice without full date is considered a violation of Internal Revenue policies.
Reports always show the full date.
We changed the date format in Odoo 19 based on user interface/user experience research showing that including a textual representation of the month is easier and more reliable to interpret than all-numeric formats. It reduces cognitive load on Users.
For any date field or date time field in Odoo 19 you can hover over it to see the traditional format:
Hi, I am a newbie here, just in fact testing and learning Odoo to see if I can use it in my small new company. Seeing that I cannot easilly set the prefered date format in all views came as a big surprise and dissapointment. People from various regions are used to various ways of displaying the date, and forcing everybody to use a format often totally different from the standard they are used to increases the cognitive load, instead of decreasing it. For me it poses a problem.
Hi,
In Odoo 19, the datepicker defaults to MMM d (e.g., Sep 18) because it uses the Luxon library with localized formats, which can be confusing compared to the old MM/dd/yyyy. You can change this by editing the Language → Date Format in settings, but the picker may still show abbreviated months. The most reliable fix is a small JavaScript override in a custom module to force MM/dd/yyyy everywhere..
Hope it helps
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So what happens if the date is not in the same year? Will it display it then?
I don't mind a format change, but would like to have the option to set it myself. The language settings don't persist to the date picker. We are running SaaS, and I can update the fields in Studio, but there are tons of them! Why can't I do this globally?
Changing the language settings does not affect the date display in the various fields (and there are many!). Is there a global way to enact this change without changing each field individually?