¿Cómo convierto esto de TSQL a MYSQL?

De la documentación:DECLARE is permitted only inside a BEGIN ... END compound statement and must be at its start, before any other statements.

Actualizar

Aquí hay algo más cerca. Deberá ordenar la sintaxis para CONVERT que es diferente en MySQL.

DELIMITER $$
CREATE PROCEDURE test()
BEGIN
    DECLARE dateInsert DATETIME;
     SET dateInsert = '1900-01-01';
     WHILE dateInsert < '2100-01-01' DO
        BEGIN
             INSERT INTO DateLookup
             (
                 DateKey, DateFull, FullYear,
                 QuarterNumber, WeekNumber, WeekDayName,
                 MonthDay, MonthName, YearDay,
                 DateDefinition,
                        CharacterDate,
                        WeekDay,
                        MonthNumber
             )

             SELECT
                 CONVERT(VARCHAR(8), dateInsert, 112), dateInsert, YEAR(@Date),
                 DATEPART(qq, dateInsert), DATEPART(ww, dateInsert), DATENAME(dw, dateInsert),
                 DATEPART(dd, dateInsert), DATENAME(mm, dateInsert), DATEPART(dy,@Date),
                       DATENAME(mm, dateInsert) + ' ' + CAST(DATEPART(dd, dateInsert) AS CHAR(2)) + ',   
                   ' + CAST(DATEPART(yy, dateInsert) AS CHAR(4)),
                   CONVERT(VARCHAR(10), dateInsert, 101),
                   DATEPART(dw, dateInsert),
                   DATEPART(mm, dateInsert)

             SET dateInsert = DATEADD(dd, 1, dateInsert)
        END
     END WHILE;
END $$