Hi Boney George,
the blog's timezone can be changed in the Blog Settings screen. To access it, log in as the blog owner, and click on the Blog Settings link. The timezone settings are on the bottom of the page, just before the Child Blog settings. Let me know if you encounter further problems. Regarding a lasting solution, I will check in Gemini if the related issue had already been submitted and if there is already a fix been created. If not, I wil add one, since I found that this issue is affecting many users now.
Best regards,
Dario Rossa