Changing the time zone only affects data going forward, and is not applied retroactively.
If you change the time zone for an existing view, you may see a flat spot or a spike in your data. This may be caused by the time shift forwards or backwards, respectively.
Report data may refer to the old time zone for a short period after you update your settings, until our servers have processed the change.
Log in to your Google Analytics account and click on Admin settings, then go to View Settings.
Choose your current time zone and hit the save button!
Have any questions? Let us know, we are only an email message away: firstname.lastname@example.org