I was having a little trouble with the Birthday plug-in, so I created a query to do it. It’s simple, using the user’s “current time” to condition on birthday month.
The first query displays a list of all the birthdays for the month.
The second query performs a match on today’s birthdays.
<h2 class="sidetitle">{current_time format="%F"} Birthdays</h2>
{exp:query sql="SELECT screen_name, bday_d, bday_m FROM exp_members WHERE bday_m = '{current_time format="%n"}' ORDER BY bday_m ASC "}
{screen_name}: {current_time format="%F"} {bday_d}<br />
{/exp:query}
{exp:query sql="SELECT screen_name, bday_d, bday_m FROM exp_members WHERE bday_m = '{current_time format="%n"}' AND bday_d = '{current_time format="%j"}' ORDER BY bday_m ASC "}
<br /><b>Happy Birthday, {screen_name}!</b><br />
{/exp:query}