I think that what you are after can be easily done using $TIMESHIFT command of ASCII importer. Provided that your old TS data are in text files you can import them and time-shift them during importing using
$TIMESHIFT importer command. It allows fractional shifts so not only hour shifts are possible but also minute.
For example 1/60 of hour would be one minute, so
$TIMESHIFT 0.16666666666
will give you one minute shift forward, and
$TIMESHIFT -0.16666666666
will give you one minute shift backward.
More info in ASCII importer reference http://www.amibroker.com/guide/d_ascii.html#TIMESHIFT
$TIMESHIFT importer command. It allows fractional shifts so not only hour shifts are possible but also minute.
For example 1/60 of hour would be one minute, so
$TIMESHIFT 0.16666666666
will give you one minute shift forward, and
$TIMESHIFT -0.16666666666
will give you one minute shift backward.
More info in ASCII importer reference http://www.amibroker.com/guide/d_ascii.html#TIMESHIFT