davidg666 wrote:Oh yes - I meant that the graphs should show the local time of the city for each graph, not that they should adjust the time for the user looking at the graph - who could be anywhere anyway.
That way, it would be easier to compare graphs for different cities in different time zones - it looks a little awkward when a city outside your timezone appears to have its evening rush between 1800 and 2000 instead of 1700 and 1900. I expect this will become more important if you add more cities that are further apart.
The base idea is good. What about the data gaps/overlaps because of Daylight Saving Time jumps twice a year, interpolate? Or let's ignore DST changes and use the base time zone shift (usually during the winter time)? Neither option is ideal.