Method does not exist or incorrect signature: void format(String) from the type Date

Question

The below code is throwing error

   Line 2931: Xmlstreamwriter.writeCharacters((Account.Date_From__c==null)?'':Account.Date_From__c.format('MM/dd/yyyy hh:mm a'));

Compile Error: Method does not exist or incorrect signature: void format(String) from the type Date at line 2,931 column 115

I tried Changing it to Account.Date_From__c.format('EEEE'), but didn't work

Answer 1

Date does not have a format() method accepting a string. That method is available only on DateTime. You can create a DateTime from a Date and simply use a format string that does not include time-based components:

DateTime.newInstance(myDate.year(), myDate.month(), myDate.day()).format('MY_FORMAT_STRING');

There's a number of Ideas out there you can vote on, although the point totals suggest they'll never be looked at: one and two (mine).