// cycle-30hr.el — CycleCalendar with a 30-hour period.
// Two CalendarTimes 15 hours apart should have cycle_phase differ by 0.5.
// We compare phases via float subtraction with format_float for determinism.

fn run_test() -> String {
    let period: Duration = 30.hours
    let cal: Calendar = cycle_calendar(period)
    let base: Instant = unix_seconds(0)
    let later: Instant = base + 15.hours
    let ct1: CalendarTime = in_calendar(base, cal)
    let ct2: CalendarTime = in_calendar(later, cal)
    let p1: Float = cal_cycle_phase(ct1)
    let p2: Float = cal_cycle_phase(ct2)
    let diff: Float = p2 - p1
    return format_float(diff, 1)
}

fn main() -> Void {
    println(run_test())
}