I'm trying to write an if/countif function for the following situation:

if column L has the 2nd and 3rd #s that are "01" then write "01" in column M
if column L has the 2nd and 3rd #s that are "02" then write "02" in column
M, etc.
all the way to 12. (01, 02,....12 standing for the days of the month.)

I wrote:
if(countif(L3,"?01*"),"01",if(countif(L3,"?02*")," 02",if(countif(L3,"?03*"),"03", etc.
but it's wrong b/c I don't know how to write a long if function.

Can someone help?