func (crnI *CronInstance) nextH(inc bool) bool {
    fromH := crnI.h
    crnI.h, _ = next(crnI.crn.hours, fromH, inc)
    if crnI.nextD(crnI.h > fromH || inc && crnI.h == fromH) {
        crnI.h, _ = next(crnI.crn.hours, 0, true)