If it's in days, day 1 is 29 November and, therefore, 30 November would be the day "it" (whatever "it" might be) would be due to happen.
Anyone got any bright ideas whether
has any photographic / Ilford / Harman connections?
36 could, of course, have something to do with the number of shots on a standard roll of 35mm film (unless you buy a 24 or 12 roll, of course......

)