Obtains an instance of ZoneOffset using an offset in hours, minutes and seconds.

The sign of the hours, minutes and seconds components must match. Thus, if the hours is negative, the minutes and seconds must be negative or zero.

Parameters:

hours		the time-zone offset in hours, from -18 to +18
minutes		the time-zone offset in minutes, from 0 to ±59, sign matches hours and seconds
seconds		the time-zone offset in seconds, from 0 to ±59, sign matches hours and minutes

Returns:  the zone-offset, not null

Exceptions:

DateTimeException

if the offset is not in the required range