[amibroker] Chart times drifting due to daylight savings

["David Clayworth" <dclayw@xxxxxxxxxxxxxx>]

Looking for some information on the easiest way to handle multiple time
zones in AmiBroker so that times for any symbol do not drift due to daylight
savings. As a simple example consider just 2 time zones. I have a chart for
a market in each of these 2 time zones, the 2 symbols are in the same
database. I use IB data which does not have a timestamp as a part of the
quote stream, so the charts display my local time. Chart1 (in timezone1, my
local timezone) has trading times of 10am-4pm. Chart2 (in timezone2) also
displays my local times (timezone1 times) and it's trading times (in my
local time) are 12pm-6pm. Timezone2 is actually 2 hours behind timezone1 so
the actual (timezone2) trading times for Chart2 is 10am-4pm. So the markets
have exactly the same trading times, they are just in different timezones.

Much of my trading is time-based so correct times are important. It does not
matter that chart2 displays times that are incorrect by 2 hours, as long as
the times for that market do not drift. Lets say that timezone1 switches to
daylight savings time. There is no problem for chart1 in timezone1 because I
simply adjust my computer clock to match daylight savings time and the chart
times remain the same as they did before, 10am-4pm. But timezone2 does not
have daylight savings (or it might start several weeks later), so the times
in Chart2 will now have times 1pm-7pm.

When timezone1 switches to daylight savings I want the times for my chart2
(in timezone2) to remain the same, i.e. 12pm-6pm. Does anyone know how to
achieve this. The Time Shift setting would do the trick but that setting
applies to the entire database.

Thanks
Dave