package grib

import (
	"fmt"
	"hash/fnv"
	"time"
)

func nearestRun(t time.Time) time.Time {
	h := t.UTC().Hour() - t.UTC().Hour()%6
	return time.Date(t.Year(), t.Month(), t.Day(), h, 0, 0, 0, time.UTC)
}

func encodeKey(a ...any) uint64 {
	h := fnv.New64a()
	for _, v := range a {
		fmt.Fprint(h, v)
	}
	return h.Sum64()
}