calculating a records age

Hi I'm trying to calculate a record's age in hours, and the output doesn't make sense to me, am I missing something?

here's the code:

info "the date-time now is " + now ;
for each offer in offerslist
{
bday = offer.get("Created_Time");
info bday;
rn = now;
ageinhours = hoursBetween(bday, rn);
info ageinhours;
}

and the output is:

the date-time now is 28-Aug-2022 16:01:28

2022-08-29T01:35:26+03:00

-7

2022-08-28T19:44:27+03:00

I get why the first age is a minus, but they both still don't add up(there are 9 hours between the first one and now, and 3 hours between the second one)

Thanks in advance:)