Calculate the difference between two DateTimes in Salesforce

In Formula Calculate the second difference between two DateTimes. In Visualforce Page Calculate the second difference between two DateTimes. In Apex ※A “Date/time arithmetic expressions must use Integer, Decimal or Double arguments” error will be occurred, when we subtract between two DateTimes directly like Formula.

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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

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How to access static resources from Apex, Visualforce and Custom Button

In Apex Normal file (with soql) Normal file (with PageReference.getContent) Zip file (with PageReference.getContent) ※Zip file can not be accessed by soql. In VF Normal file Zip file In Custom Button

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