[SalesForce] the difference between printing System.now() and after using String.valueOf(System.now())

Hi i am not able to understand What is the difference between printing System.now() and after using String.valueOf(System.now()) bcz both giving me different out/put.
Example:

System.debug(' date()'+System.now()); getting o/p 2013-08-12 06:26:18
System.debug(' date()'+String.valueOf(System.now())); o/p 2013-08-11 23:26:18

Can any one please explain me why i am getting two different date outputs.

Best Answer

System.debug(' date()'+String.valueOf(System.now())); o/p 2013-08-11 23:26:18

This will be as per local time zone of the user 

System.debug(' date()'+System.now()); getting o/p 2013-08-12 06:26:18

Returns the current date and time in the GMT time zone.

Reference:

http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_methods_system_system.htm http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_methods_system_string.htm

Update:

http://www.salesforce.com/us/developer/docs/soql_sosl/Content/sforce_api_calls_soql_select_convert_time_zone.htm

SOQL queries in a client application return dateTime field values as Coordinated Universal Time (UTC) values. You can use convertTimezone() in a date function to convert dateTime fields to the user's time zone.

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