Changing DATE format in SQL

Hi! I want to change the date format from MM-DD-YYYY  to YYYY-MM-DD in my SQL query.

Current Output:

http://s665.photobucket.com/user/veniceluvschoco/media/sql%202_zpsz56stteg.png.html

Desire Output:

http://s665.photobucket.com/user/veniceluvschoco/media/sql%201_zpsqrg0upro.png.html

Below is my current SQL Query:

table#t(SHIFTA_STARTdatetime,SHIFTA_ENDdatetime)

selectSHIFTA_START,

,

casewhendatediff(d,CONVERT(DATETIME,LEFT(SHIFTA_START,17),103),CONVERT(DATETIME,LEFT(SHIFTA_END,17),103))>0then

dateadd(minute,23*60+59,dateadd(day,datediff(day,'20010101', CONVERT(DATETIME,LEFT(SHIFTA_START,17),103)),'20010101'))elseCONVERT(DATETIME,LEFT(SHIFTA_END,17),103)endasShiftTime

from[tablename].[dbo].[TMS_PEOPLE]

ANDCONVERT(DATETIME,LEFT(SHIFTA_START,17),103)!=''ANDCONVERT(DATETIME,LEFT(SHIFTA_END,17),103)!=''

Would appreciate if anyone out there could help! Thank you :-)