A compromise of complexity of the "opening_hours".
Only the `day-day time-time" will work for now.
https://openingh.openstreetmap.de/evaluation_tool/?setLng=en
oh := openhours.New("Mo-Fr 09:00-17:00")
t := time.Date(2019, 3, 6, 10, 0, 0, 0, time.Now().Location())
// oh.Location = t.Location() //default to system but can be changed this way
fmt.Println("t =", t)
isOpen := oh.Match(t)
fmt.Println("Is it open at this date?", isOpen)
_, duration := oh.NextDur(t)
fmt.Println("For how long?", duration)
_, date := oh.NextDate(t)
fmt.Println("When will it close?", date)
fmt.Println(" +++++++++++++++++++++ ")
t = time.Date(2019, 3, 6, 18, 0, 0, 0, time.Now().Location())
fmt.Println("t =", t)
isOpen, date = oh.NextDate(t)
fmt.Println("Is it open?", isOpen, "Ok, when will it open then ?", date)
/* output
t = 2019-03-06 10:00:00 +0000 GMT
Is it open at this date? true
For how long? 7h0m0s
When will it close? 2019-03-06 17:00:00 +0000 GMT
+++++++++++++++++++++
t = 2019-03-06 18:00:00 +0000 GMT
Is it open? false Ok, when will it open then ? 2019-03-07 09:00:00 +0000 GMT
*/