Google announced on Google+ that users can now set timezones for AdWords conversion imports.
Google said, “Daylight saving time or collaborating across multiple regions can cause unexpected upload errors. Having the right time zones set for your conversions in AdWords can improve reporting accuracy. That’s why you can now specify time zones for your conversion imports with timezone IDs.”
It further stated, “You still have the option to enter the difference between your time zone and Greenwich Mean Time (GMT offset). In addition, you can set a single time zone for all your conversions, or different ones for each conversion.”
Download timezone IDs here.