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Calculate a Time Based on Known Date Plus Decimal Hours

 
Ranch Hand
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I need to generate a calculated finish time based on a known start date and the hours spent to complete it.

My code works good unless the hours spent are less than 1 or the hours have a fraction.

 
Rancher
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unless the hours spent are less than 1 or the hours have a fraction.


How would you calculate the end date if you did it by hand? The Calendar class can add units of time besides hours. Can you convert the non-integer hours to some other time units?
 
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If you are using Java 8 you may want to look at the new java.time API which makes it so much easier to handle times.
 
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