After adding date field to matrix field type getting following error in ADMIN panel:
A PHP Error was encountered
Severity: Notice
Message: Undefined index: Europe/London
Filename: libraries/Localize.php
Line Number: 735
After adding date field to matrix field type getting following error in ADMIN panel:
A PHP Error was encountered
Severity: Notice
Message: Undefined index: Europe/London
Filename: libraries/Localize.php
Line Number: 735
In your control panel what is the value of Admin > Localization Settings > Site Timezone?
I don't see "Europe" as a choice in EE 2.8.1 and expect this is the cause of your problem.
Trying changing to "United Kingdom" + "London"