Go from Local Time to UTC with respect to the dates I have!

24 views (last 30 days)
Hi guys, I need your expertise on that.
I have a column with dates and time (see attached) which is in Local Time Zone (Europe/Athens) and I want to convert it to UTC. I know this is pretty straight forward but the problem lies here:
If you notice on the attached .xlsx, arrows between 25103 and 25104 are missing the date 29-Mar-2015 03:00:00. That is because the weather station was using Daylight Saving Time for the entire year (UTC+0300), and I tried to change that and keep UTC+0200 for wintertime. Therefore I missed 29-Mar-2015 04.00 (which was the time that Greece changed from UTC+0200 to UTC+0300) and I have a double entry for 25-Oct-2015 03.00 ( (which was the time that Greece changed from UTC+0300 to UTC+0200).
When I try to go from LT to UTC with
LT.TimeZone = 'UTC';
I am losing information about the two errorous dates I mentioned (29-Mar-2015 03:00:00 and 25-Oct-2015 03.00). Which means that I am creating a column with all dates starting from 31/12/2014 21.00 to 31/12/2015 22.00.
Is there a solution to my problem? I would appreciate your thoughts...

Accepted Answer

Star Strider
Star Strider on 16 Mar 2020
The data in your Excel file need a bit of preprocessing, then the conversion is straightforward:
D = readtable('Date-Time.xlsx','ReadVariableNames',0);
D.Var1 = datetime(strrep(D.Var1, '''', ''), 'TimeZone','Europe/Athens');
then to do the conversion:
Original = D.Var1(1:5,:) % Information Only (Delete)
D.Var1.TimeZone = 'UTC';
New = D.Var1(1:5,:) % Information Only (Delete)
producing:
Original =
5×1 datetime array
31-Dec-2014 23:00:00
31-Dec-2014 23:00:00
31-Dec-2014 23:00:00
31-Dec-2014 23:00:00
31-Dec-2014 23:00:00
New =
5×1 datetime array
31-Dec-2014 21:00:00
31-Dec-2014 21:00:00
31-Dec-2014 21:00:00
31-Dec-2014 21:00:00
31-Dec-2014 21:00:00
  7 Comments

Sign in to comment.

More Answers (0)

Categories

Find more on Dates and Time in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!