On your WordPress website you may want to update the date format setting for the website on there.
You can update the date format for your WordPress website without using a plugin on there
- From the WordPress admin left menu you can click on settings > general
- From the general settings page there is a date format area you can click on
- You can look through the list to find the date format in that area you want to set your website to
- You can then click on the save button at the bottom of the general settings page
If that works for you it would then update the setting for the date format in that area for your WordPress website on there.