Custom Field in Account to update when Contact is created:
Sample Trigger:
trigger ContactTrigger on Contact ( after insert ) {
Set < Id > setAccountIds = new Set < Id >();
for ( Contact objContact : trigger.new ) {
if ( String.isNotBlank( objContact.AccountId ) ) {
setAccountIds.add( objContact.AccountId );
}
}
if ( setAccountIds.size() > 0 ) {
List < Account > listAccounts = new List < Account >();
Date dtToday = Date.today();
for ( Id accId : setAccountIds ) {
listAccounts.add( new Account( Id = accId, Last_Contact_Created_Date__c = dtToday ) );
}
update listAccounts;
}
}