Start MAMP (not MAMP PRO) from your Applications folder. You can configure MAMP so it automatically starts/stops Apache/MySQL. Dashboard on http://localhost:8888/MAMP/
Fatal error: Uncaught Error: Class "IntlDateFormatter" not found in...
Reason:
This is due to a php internatinalization extension being excluded by default in MAMP distributions of wordpress.
Solution:
1 Turn off the running instnaces in MAMP with the “Stop servers” button
2 Confirm the version of php used in MAMP (MAMP → Preferences → Press “PHP”)
3 For the version you use, find the php.ini file e.g. open C:\MAMP\conf\php8.2.14\php.ini file and find the below line, then remove comment (;) at the start of it, i.e.:
;extension=php_intl.dll
=>
extension=php_intl.dll
4 Save the file
5 Restart the servers, then reload the workpress page, and the error should be gone.