Hi Sasa,
If you download a file using the "EPW" option from this page,
re.jrc.ec.europa.eu/pvg_tools/en/tools.html#TMY, you should get a file with correct time stamps.
Otherwise, you can adjust the data in the file by copying the appropriate number of rows last day of the year to the first day of the year to shift the data. Usually this works because there is no sun in the night time hours, so shifting the rows does not affect the irradiance data.
Best regards,
Paul.