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The new LearnerThe new Learner 

how to convert milliseconds to date

HI Experts,

i am trying to get the difference between two dates using business hours difference method like below to exclude holidays and weeknds while converting milliseconds in to date i am not getting anything can anyone help please.
here is method

 long temp= BusinessHours.diff(

output: DEBUG|temp-1020 

DateTime gmtDatetime = DateTime.newInstance(temp);

output: gmtDatetime1969-12-31 23:59:58

Danish HodaDanish Hoda
Hi there,
May I know what's logic in 

If you want to subtract 3 days from the ri.Completion_Date__c , please try using ri.Completion_Date__c.addDays(-3)