Timeseries-object with daylight saving time

Hello,

i use a timeseries-object whose Time-vector consists of serial-date-numbers. At the end of the daylight saving time we have the hour 02:00 twice (in the CEST timezone). To ensure unique datenumbers, i added a very small value to the second hour 02:00.

As i have only hourly values, there's no problem. The second hour 02:00 is ordered directly behind the first one. But if i have half ours, the ordering within the timeseries-object is wrong and the values are displayed in the order 02:00, 02:00_2, 02:30, 02:30_2 instead of 02:00, 02:30, 02:00_2, 02:30_2.

Is there a chance that the timeseries doesn't automatically orders the time-values if i insert them?

greets

[per isakson]

Daylight saving time is a pain!

Answer 1

[Clément]

Hi,

I would suggest to convert you Time-vector to UTC by removing 1 hour or 2 depending on the year period. For your future captures, you can use another function to replace clock() or now() :

function [t] = nowUTC()
t = java.lang.System.currentTimeMillis / 8.64e7 + datenum(1970, 1, 1);

This is java-based and returns UTC time, that will never overlap.

Clement

[Gregor]

Hi,

thank you for your answer. As this Topic lasts for such a Long time I already found a quite good solution. I store the time data within a timeseries object in CET (central european time) without summer time transitions.