https://stackoverflow.com/questions/2532729/daylight-saving-time-and-time-zone-best-practices
And we are not yet talking about opening times during “la pause cafe”, French holidays, local strike calendar, leap years and 2000 problem bug :)
Zorg wrote:
Hrm … but this is not consistent with the above discussion, where “UTC WIN; SUM SKED: -1HR” meant “apply -1 hour offset to times in summer”. Or does the separate specification for summer and winter imply that the above rule does not apply (i.e., the part about “Timetables unless otherwise specified”)?My feeling is that this “clever” way of specifying times creates more confusion than worth it …
It is coherent. The gerenric statement is unless otherwise specified.
For Calvi they have written specific times for the summer and winter.
But this is not always the case eg LFQG
So if the AIP says open from 7.30 to 16.30
in the winter it is from 7.30 to 16.30 UTC ==> 8.30 to 17.30 local time
in the summer it is from 6.30 to 15.30 UTC ==> 8.30 to 17.30 local time
No. It’s:
Summer: 0445 UTC equals 06:45 LT until sunset+30 min
Winter: 0545 UTC equals (again) 6:45 LT until sunset+30 min
I’ve no doubt that your end result is what the writers intended.
But I don’t follow your logic on the Summer time.
You’re taking the summer opening time as 0445UTC and converting to local. But the heading specifies that the summer time is UTC-1. So 0445 would equate to 0545UTC then convert to local.
As I say, I’m sure you are right on what they intended. But it means that that SKED SUM: -1Hr is totally superfluous because they’ve already specified the times as UTC for both summer and winter.
It’s a terrible way of specifying time. They should just stuck to UTC like everyone else and stop trying to be clever
Emir wrote:
No, it’s not. It’s exactly as I wrote above – it’s always from 06:45 LT, which is 05:45 UTC in winter and 04:45 UTC in summer.
The passage “Timetables unless otherwise specified UTC WIN; SKED SUM: -1HR” is not crystal clear. There are generally lots of very strange English translations in the French AIP. E.g. according to ICAO Doc 8400, “SKED” means “schedule(d)”, which doesn’t make sense to me in this context.
Ibra wrote:
Correct
No, it’s not. It’s exactly as I wrote above – it’s always from 06:45 LT, which is 05:45 UTC in winter and 04:45 UTC in summer.
Zorg wrote:
Is my following interpretation correct?
Summer: 0445 UTC – 1 hour offset → 0345 UTC → 0545 L
Winter: 0545 UTC → 0645 L
Correct, again: +1h to any time you see in French AIP gives you LT (usually LT will be the for Winter/Summer )
For once, you have airfield opening LT time that differs between Winter/Summer, but still AIP + 1h = LT does work
Emir wrote:
No. It’s:Summer: 0445 UTC equals 06:45 LT until sunset+30 min
Winter: 0545 UTC equals (again) 6:45 LT until sunset+30 minSo basically, airport has same working hours in local time which is completely normal and expected because people working on it usually have same working hours all year around. And SS is important due to LFKC specifics and surrounding terrain.
Hrm … but this is not consistent with the above discussion, where “UTC WIN; SUM SKED: -1HR” meant “apply -1 hour offset to times in summer”. Or does the separate specification for summer and winter imply that the above rule does not apply (i.e., the part about “Timetables unless otherwise specified”)?
My feeling is that this “clever” way of specifying times creates more confusion than worth it …
Zorg wrote:
Is my following interpretation correct?Summer: 0445 UTC – 1 hour offset → 0345 UTC → 0545 L
Winter: 0545 UTC → 0645 L
No. It’s:
Summer: 0445 UTC equals 06:45 LT until sunset+30 min
Winter: 0545 UTC equals (again) 6:45 LT until sunset+30 min
So basically, airport has same working hours in local time which is completely normal and expected because people working on it usually have same working hours all year around. And SS is important due to LFKC specifics and surrounding terrain.
The VAC of Calvi LFKC specifies ATS hours as follows:
Is my following interpretation correct?