Date format and DateTime format

Date format in Apex 1.Use Date format method 2.Convert to String directly 3.Convert to DateTime DateTime format in Apex Date format in VF DateTime format in VF Date format in Formula DateTime format in Formula TZoffset is the　difference between the user’s time zone and GMT。 When in Tokyo：TZoffset = “9/24” Reference : https://help.salesforce.com/help/pdfs/en/formula_date_time_tipsheet.pdf