Yesterday and today date in mysql

My date column in my database is in this format: date('Y-M-j H:i:s');. A am trying to run a query to get all transactions done today and another one for all transactions done yesterday. Please help on best way to do this.

I tried the below but it wasn't working

 $yesterday = date("Y-M-j 00:00:01", strtotime("-1 day"));
$yesterday2 = date("Y-M-j 23:59:59", strtotime("-1 day"));

$query_syesterday = "SELECT sum(amount), sum(amtnaira) FROM transactions WHERE transtype = 'buy' AND batch !='' AND date BETWEEN '$yesterday' AND '$yesterday2'";
$syesterday = mysql_query($query_syesterday, $egold1) or die(mysql_error());
$row_syesterday = mysql_fetch_assoc($syesterday);
$totalRows_syesterday = mysql_num_rows($syesterday);