Convert decimal representing time to hour, minutes, seconds

Question

I have a decimal. The range of this decimal is between 0 and 23.999999. This decimal represents a time. For example, if the decimal is 0.25, then the time it represents is 1

Answer 1

you can use the floor function to strip off the hours and leave the minuites and seconds as a fraction of an hour. Then you can use the floor function again to strip off the minuites as a fraction of an hour. you are then left with the seconds ( as fractions of an hour )

below a simple example to print hours and mins sunrise is in fractional hours since midnight

printf( "sunrise %ld:%ld, \n", 
             (long)floor( sunrise ),
                 (long)(floor( sunrise * 60 ) - 60 * floor( sunrise )) );