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calcular diferença entre duas horas


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Boas, eu preciso de calcular a diferença entre 'hora a' e 'hora b'.

se 'a' for maior que 'b' não há qualquer problema, mas se 'b' for maior que 'a' como posso fazer?

exp: calcular a diferença entre 23h e 5h. sei que são 6h de diferença, mas como posso calcular isso matemáticamente?

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Se for negativo somas 24 e ficas com a diferença.

“There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult.”

-- Tony Hoare

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