If you find any timezone data error from 1970 to current time, you convince me about the correctness of your claim so much that I change the time of WTE based on your observation, then you get a free license of World Time Explorer.

If you can base your claim on a web page, that I can read, then there is more probability that I will accept your claim. If you only have a newspaper or book reference that is not publicly available in Mexico, then I will have to investigate the claim to see if I can confirm it with some other means.

Authoritative information based on a governments official web page is the best source you can give. Send your claim of a data error to support@worldtimeexplorer.com.

In the shareware version, you can only see information for the current year and the year 1950. So if you want to check timezone information from  other times and you don't have the full license, please check the text file Historic.txt instead - the help file explains the format of this file.