Hi, i am having a problem with a form where a user can enter there birthday when they register. In the database it does not show up, it only shows the default value 0000-00-00. I am using month, date and year in the form and i am wondering is there a function or anything that can correct this problem.

We would need to see the code to be able to offer any real help.
Void of that, I can do little more than direct you to the PHP manual. You could start by looking over the Date/Time Function section.

first you should create the date in variable with your day,month,year data and submit it in database in the format YYYY-MM-DD.
your date should be in YYYY-MM-DD format.

I just need to know how i can put together information from three different select options in html so they can be sent to the mysql database. I know im doing something wrong but i cant figure it out, thanks for your help.

<td style="padding-top: 3px;">
			<select name="birthday_day" class="inputtext">
			<option value="">Day</option>
			<option value="1" >1</option><option value="2" >2</option><option value="3" >3</option><option value="4" >4</option><option value="5" >5</option><option value="6" >6</option><option value="7" >7</option><option value="8" >8</option><option value="9" >9</option><option value="10" >10</option><option value="11" >11</option><option value="12" >12</option><option value="13" >13</option><option value="14" >14</option><option value="15" >15</option><option value="16" >16</option><option value="17" >17</option><option value="18" >18</option><option value="19" >19</option><option value="20" >20</option><option value="21" >21</option><option value="22" >22</option><option value="23" >23</option><option value="24" >24</option><option value="25" >25</option><option value="26" >26</option><option value="27" >27</option><option value="28" >28</option><option value="29" >29</option><option value="30" >30</option><option value="31" >31</option>            </select> 
            <select name="birthday_month" class="inputtext">
           	<option value="">Month</option>
			<option value="1" >January</option>
			<option value="2" >February</option>
			<option value="3" >March</option>
			<option value="4" >April</option>
            <option value="5" >May</option>
            <option value="6" >June</option>
            <option value="7" >July</option>
            <option value="8" >August</option>
			<option value="9" >September</option>
            <option value="10" >October</option>
			<option value="11" >November</option>
			<option value="12" >December</option>
            </select> 
            <select name="birthday_year" class="inputtext">
			<option value="">Year</option>
			<option value="1900" >1900</option><option value="1901" >1901</option><option value="1902" >1902</option><option value="1903" >1903</option><option value="1904" >1904</option><option value="1905" >1905</option><option value="1906" >1906</option><option value="1907" >1907</option><option value="1908" >1908</option><option value="1909" >1909</option><option value="1910" >1910</option><option value="1911" >1911</option><option value="1912" >1912</option><option value="1913" >1913</option><option value="1914" >1914</option><option value="1915" >1915</option><option value="1916" >1916</option><option value="1917" >1917</option><option value="1918" >1918</option><option value="1919" >1919</option><option value="1920" >1920</option><option value="1921" >1921</option><option value="1922" >1922</option><option value="1923" >1923</option><option value="1924" >1924</option><option value="1925" >1925</option><option value="1926" >1926</option><option value="1927" >1927</option><option value="1928" >1928</option><option value="1929" >1929</option><option value="1930" >1930</option><option value="1931" >1931</option><option value="1932" >1932</option><option value="1933" >1933</option><option value="1934" >1934</option><option value="1935" >1935</option><option value="1936" >1936</option><option value="1937" >1937</option><option value="1938" >1938</option><option value="1939" >1939</option><option value="1940" >1940</option><option value="1941" >1941</option><option value="1942" >1942</option><option value="1943" >1943</option><option value="1944" >1944</option><option value="1945" >1945</option><option value="1946" >1946</option><option value="1947" >1947</option><option value="1948" >1948</option><option value="1949" >1949</option><option value="1950" >1950</option><option value="1951" >1951</option><option value="1952" >1952</option><option value="1953" >1953</option><option value="1954" >1954</option><option value="1955" >1955</option><option value="1956" >1956</option><option value="1957" >1957</option><option value="1958" >1958</option><option value="1959" >1959</option><option value="1960" >1960</option><option value="1961" >1961</option><option value="1962" >1962</option><option value="1963" >1963</option><option value="1964" >1964</option><option value="1965" >1965</option><option value="1966" >1966</option><option value="1967" >1967</option><option value="1968" >1968</option><option value="1969" >1969</option><option value="1970" >1970</option><option value="1971" >1971</option><option value="1972" >1972</option><option value="1973" >1973</option><option value="1974" >1974</option><option value="1975" >1975</option><option value="1976" >1976</option><option value="1977" >1977</option><option value="1978" >1978</option><option value="1979" >1979</option><option value="1980" >1980</option><option value="1981" >1981</option><option value="1982" >1982</option><option value="1983" >1983</option><option value="1984" >1984</option><option value="1985" >1985</option><option value="1986" >1986</option><option value="1987" >1987</option><option value="1988" >1988</option><option value="1989" >1989</option><option value="1990" >1990</option><option value="1991" >1991</option><option value="1992" >1992</option><option value="1993" >1993</option><option value="1994" >1994</option><option value="1995" >1995</option><option value="1996" >1996</option><option value="1997" >1997</option><option value="1998" >1998</option><option value="1999" >1999</option><option value="2000" >2000</option><option value="2001" >2001</option><option value="2002" >2002</option><option value="2003" >2003</option><option value="2004" >2004</option><option value="2005" >2005</option><option value="2006" >2006</option><option value="2007" >2007</option><option value="2008" >2008</option><option value="2009" >2009</option><option value="2010" >2010</option>            </select>
		</td>
$birthday_day = $_POST['birthday_day'];
	 $birthday_month = $_POST['birthday_month'];
	 $birthday_year = $_POST['birthday_year'];
	 $birthday = strtotime($birthday_year, $birthday_month, $birthday_day);

why not you use the below syntax:

$birthday = "$birthday_year-$birthday_month-$birthday_day";

in the replace of line:

$birthday = strtotime($birthday_year, $birthday_month, $birthday_day);

this will work and given output in YYYY-MM-DD format.

Thanks a lot man, it worked fine.

Yes,also keep in mind that strtotime() converts the date to a unix timestamp which is alien to the mysql date format. It is also useless for any date prior to 1970 (the unix epoc).

When and if you decide to display the date , the raw output will be in the mySql format unless you operate on it to display in another format.