Concepts or coding lessons of Salesforce that you can implement easily

Subtraction of Two Time Fields No Longer Produces Negative Results in Salesforce

Previously, subtraction of two time datatype fields in Salesforce could result in a negative value.

Starting in the Summer '18 release, subtraction is always a positive value on a 24-hour clock.

Example:


When calculating the number of hours a business is open, you use the following formula (also taking into account each hour is 3,600,000 milliseconds):

(ClosedTime - OpenTime) / 3600000

ClosedTime = 5 PM, OpenTime = 8 AM, 
then result is ClosedTime - OpenTime = 9 hours

ClosedTime = 5 AM, OpenTime = 7 AM, 
then result is ClosedTime - OpenTime = 22 hours

ClosedTime = 5 AM, OpenTime = 11 PM, 
then result is ClosedTime - OpenTime = 6 hours


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