Date dependant movie clip

hi,

i want to make a movie clip visible depending on what time of year it is.

e.g i want a snow movie clip to play in winter and leaves to blow in autumn.

Any ideas on how to do this? i guess i would make all four clips (for the 4 seasons) and place them on the stage. I would then code it so that only one is visible at a time and this is determined by the month of the year.

any ideas for the actionscript necessary to obtain the date and show the relevant movie clip?