>Thanks!
>Albert

Just to let you know

There is a lot of IF in the code to form a ring. Typical codemonkey approach. :)

This could be done quicker with the following formula using modulo:

lnHours = 24
lnNewHour = (lnOldHour+lnChange)%lnHours

try

clear
lnOldHour = 24
lnHours = 24
lnd = 1
FOR lnchange = 1 TO 25
lnOldHour = (lnOldHour-lnd)%lnHours
?lnOldHour
ENDFOR &&lnx 

or

clear
lnOldHour = 24
lnHours = 24
lnd = 1
FOR lnchange = 1 TO 25
lnOldHour = (lnOldHour+lnd)%lnHours
?lnOldHour
ENDFOR &&lnx 

new you loop between 1 and 00

lots of if less :)

and even if somebody enters 55 -> the modulo will fit it.

Lutz