• Our booking engine at tickets.railforums.co.uk (powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!

NRE journey planner DST bug

Status
Not open for further replies.

maniacmartin

Established Member
Fares Advisor
Joined
15 May 2012
Messages
5,394
Location
Croydon
NRE’s journey planner appears to erroneously add an extra hour to the journey time if the journey crosses 01:00 on the day that daylight savings time ends.

An example is the 23:09 departure in this screenshot which NRE thinks takes 3 hours. Other planners such as FastJP.co.uk correctly identify this itinerary as taking 2 hours.
 

Attachments

  • 9A862297-C152-4A67-802D-850931BDEF55.jpeg
    9A862297-C152-4A67-802D-850931BDEF55.jpeg
    75.2 KB · Views: 58
Sponsor Post - registered members do not see these adverts; click here to register, or click here to log in
R

RailUK Forums

PHILIPE

Veteran Member
Joined
14 Nov 2011
Messages
13,472
Location
Caerphilly
NRE’s journey planner appears to erroneously add an extra hour to the journey time if the journey crosses 01:00 on the day that daylight savings time ends.

An example is the 23:09 departure in this screenshot which NRE thinks takes 3 hours. Other planners such as FastJP.co.uk correctly identify this itinerary as taking 2 hours.

The weekend the clocks change
 

greatkingrat

Established Member
Joined
20 Jan 2011
Messages
2,749
Looking at 9T21 2335 Bedford - Brighton 0228 which is running at the changeover time.

NRE shows dep 2335, arr 0228, duration 3:53, which implies the train will stop at 0200 BST, wait for an hour until 0200 GMT, then carry on to Brighton.

FastJP shows dep 2335, arr 0228, duration 2:53, which isn't really correct as either it arrives at 0228 GMT, or it has a duration of 2:53, it can't do both.

I think the issue is the data doesn't specify whether a particular time between 0100 and 0159 is BST or GMT, so websites have to guess. In practice I suspect the train will run to BST throughout.
 

alistairlees

Established Member
Joined
29 Dec 2016
Messages
3,724
Looking at 9T21 2335 Bedford - Brighton 0228 which is running at the changeover time.

NRE shows dep 2335, arr 0228, duration 3:53, which implies the train will stop at 0200 BST, wait for an hour until 0200 GMT, then carry on to Brighton.

FastJP shows dep 2335, arr 0228, duration 2:53, which isn't really correct as either it arrives at 0228 GMT, or it has a duration of 2:53, it can't do both.

I think the issue is the data doesn't specify whether a particular time between 0100 and 0159 is BST or GMT, so websites have to guess. In practice I suspect the train will run to BST throughout.
In other words it will arrive at Brighton at 01.28 and both websites are wrong.
 

js517

Member
Joined
4 Sep 2018
Messages
159
Location
Cragg Vale, West Yorkshire
If the data doesn't specify BST/GMT, is there a documented convention that the offset doesn't change for timings within a single train record? Even so, timings for trains that start between 0100BST and 0159GMT would be ambiguous.
 

AlbertBeale

Established Member
Joined
16 Jun 2019
Messages
2,690
Location
London
NRE’s journey planner appears to erroneously add an extra hour to the journey time if the journey crosses 01:00 on the day that daylight savings time ends.

An example is the 23:09 departure in this screenshot which NRE thinks takes 3 hours. Other planners such as FastJP.co.uk correctly identify this itinerary as taking 2 hours.

"Daylight saving time"? Never heard of that [after all, it doesn't save any daylight, so it would be an illogical name for it] - surely it's called "summer time"...
 

DynamicSpirit

Established Member
Joined
12 Apr 2012
Messages
8,022
Location
SE London
"Daylight saving time"? Never heard of that [after all, it doesn't save any daylight, so it would be an illogical name for it] - surely it's called "summer time"...

The particular time zone that the UK uses for the summer months is known as 'British Summer Time'. However we aren't the only country in the World that puts the clock forward for summer, and 'daylight savings time' is the generally accepted international term for the practice of having a time zone one hour further forward in the summer months.

In other words, both terms are correct, but 'British summer time' refers specifically to the UK, whereas 'daylight saving time' could refer to any country.
 

johnr57

Member
Joined
29 Mar 2013
Messages
203
As I recall and I will check later in one of my vintage volumes, in the printed BR timetables there was a timetable note “1 hour earlier” (or later ) on the specific dates when the clicks changed
A neat advantage Of clarity over the IT !
 
Status
Not open for further replies.

Top