Fetch the greatest/Max/Min date from the list

Arun Garg   2/18/2022   Date Sort, greater value, salesforce lightning, Sorting   Comment  

As we have scenario to fetch greater date value from the multiple objects like I have to find greatest createddate from 2-3 contacts data so that this date can be used further.  

Lets consider the scenario on contact objects.

List<DateTime> listCreatedDates = new List<DateTime>();
List<Contact> cons = [select id, CreatedDate from Contact limit 2];

For(Contact c : cons) {
    listCreatedDates.add(c.CreatedDate);
}

listCreatedDates.sort();

DateTime minDate = listCreatedDates.get(0);
DateTime maxDate = listCreatedDates.get(listCreatedDates.size()-1);

System.debug('minDate : ' + minDate );

System.debug('maxDate : ' + maxDate );

Lets discuss about the above code:

Output for me - 

List<Contact> cons = [select id, CreatedDate from Contact limit 2];

minDate : 2020-02-06 07:59:15
maxDate : 2020-07-18 13:23:36