This is not correct. Why do you wanna shift 13.xx hours backward?? Timezones have full hours difference between each other with few exceptions where it it is x.5 hours for some regions. But it seems Stooq's data have CET time zone for all symbols. So since CET is EST+6 you have to shift back further 6 hours plus the previously mentioned future bar correcting fraction for 5min data. So to shift from CET to EST the line would be: $TIMESHIFT -6.0833333333 I guess you have already created a format file? If so then go to the Formats folder in the AB directory and open Stooq5min.format file with any text editor and replace timeshift line with upper one and re-save the format file.