Bad next on 'every 1 hours'

[pjbrinck]

Run this

    let date = new Date();
    console.log(later.schedule(later.parse.text('every 1 hours')).prev(2, date));
    console.log(later.schedule(later.parse.text('every 1 hours')).next(2, date));
    console.log(later.schedule(later.parse.text('every 30 minutes')).prev(2, date));
    console.log(later.schedule(later.parse.text('every 30 minutes')).next(2, date));

and notice the odd current time in entry on of line two

[ 2018-04-25T08:00:00.000Z, 2018-04-25T07:00:00.000Z ]
[ 2018-04-25T08:52:48.611Z, 2018-04-25T09:00:00.000Z ]
[ 2018-04-25T08:30:00.000Z, 2018-04-25T08:00:00.000Z ]
[ 2018-04-25T09:00:00.000Z, 2018-04-25T09:30:00.000Z ]