Dateserial question

Hello,

Could someone please let me know what exactly this function is doing?

Dateserial (2010, 03+1, 1-1)

Would it be 2010 February 28th??

Not sure about the last 2 digits...

if appt date is 2010 03 25 what would this do??

@Appt Date >=dateserial(year(currentdate),month(currentdate)-1,1) if appt date is 2010, 03 25

@Appt Date <=dateserial(year(currentdate),month(currentdate,1)-1

Thanks!