Find 'Day' & ‘Day Of Week’ From 'Date' in Salesforce.

There are many scenarios in salesforce where we need to find out day from date.
For example, for scheduling a job through system.schedule() method , we need  Day_of_week.

Date startDate = date.newInstance(0001, 1, 1); List<String> daysList = new List<String> {'null', 'Sunday' , 'Monday' , 'Tuesday' , 'Wednesday' , 'Thursday' , 'Friday','Saturday' };  Date dayForDate = system.today(); Integer remainder = Math.mod(startDate.daysBetween (dayForDate) , 7);         if(remainder==0){remainder=7;}         string calculatedDay = daysList.get(remainder); system.debug('Day of week for dayForDate ---->'+remainder); system.debug('day for dayForDate ----->'+ calculatedDay);

Get sObject Name from Record ID.....!!!!

Sometimes there are scenarios when we use

string urlID = ApexPages.currentPage().getParameters().get('id');

and develop the functionality based on urlID .

What should we do, if sometimes urlID gives ID of Object 'X' and sometimes it gives

ID of 'Y' based on business requirement?

Here is what I did....

urlId=ApexPages.currentPage().getParameters().get('id');  Map<String, Schema.SObjectType> gd = Schema.getGlobalDescribe();               Map<String,String> keyPrefixMap = new Map<String,String>{};               Set<String> keyPrefixSet = gd.keySet();              for(String sObj : keyPrefixSet){                  Schema.DescribeSObjectResult r =  gd.get(sObj).getDescribe();                  String tempName = r.getName();                               String tempPrefix = r.getKeyPrefix();                 keyPrefixMap.put(tempPrefix,tempName);                }                             string objtempPrefix =urlId.subString(0,3);                string objname =keyPrefixMap.get(objtempPrefix );                          system.debug('object name--------------->'+objname );

The first three chars of a record id refer to the sobject the record is based on.

 IF urlId is ID of X , objname will be 'X'

 IF urlId is ID of Y , objname will be 'y'