Remove now-unused SQL timestamp conversion functions added in r77231. They were made obsolete by the querypage-work2 branch merge in r78786

includes/db/Database.php

@@ -2044,16 +2044,6 @@ abstract class DatabaseBase implements DatabaseType {
 		return "REPLACE({$orig}, {$old}, {$new})";
 	}
 
-	/**
-	 * Convert a field to an unix timestamp
-	 *
-	 * @param $field String: field name
-	 * @return String: SQL statement
-	 */
-	public function unixTimestamp( $field ) {
-		return "EXTRACT(epoch FROM $field)";
-	}
-
 	/**
 	 * Determines if the last failure was due to a deadlock
 	 * STUB

includes/db/DatabaseMssql.php

@@ -787,10 +787,6 @@ class DatabaseMssql extends DatabaseBase {
 		return false;
 	}
 
-	public function unixTimestamp( $field ) {
-		return "DATEDIFF(s,CONVERT(datetime,'1/1/1970'),$field)";
-	}
-
 	/**
 	 * Begin a transaction, committing any previously open transaction
 	 */

includes/db/DatabaseMysql.php

@@ -478,9 +478,6 @@ class DatabaseMysql extends DatabaseBase {
 		$this->query( "SET sql_big_selects=$encValue", __METHOD__ );
 	}
 
-	public function unixTimestamp( $field ) {
-		return "UNIX_TIMESTAMP($field)";
-	}
 
 	/**
 	 * Determines if the last failure was due to a deadlock

includes/db/DatabaseOracle.php

@@ -839,10 +839,6 @@ class DatabaseOracle extends DatabaseBase {
 		return 'SELECT * ' . ( $all ? '':'/* UNION_UNIQUE */ ' ) . 'FROM (' . implode( $glue, $sqls ) . ')' ;
 	}
 
-	public function unixTimestamp( $field ) {
-		return "((trunc($field) - to_date('19700101','YYYYMMDD')) * 86400)";
-	}
-
 	function wasDeadlock() {
 		return $this->lastErrno() == 'OCI-00060';
 	}

includes/db/DatabaseSqlite.php

@@ -431,10 +431,6 @@ class DatabaseSqlite extends DatabaseBase {
 		return implode( $glue, $sqls );
 	}
 
-	public function unixTimestamp( $field ) {
-		return $field;
-	}
-
 	function wasDeadlock() {
 		return $this->lastErrno() == 5; // SQLITE_BUSY
 	}