Then there is always…
SELECT
FORMAT(DATEADD(SECOND, PartTran.SysTime, CAST(PartTran.SysDate as DateTime)), 'HH.mm') as time1,
DATEADD(SECOND, PartTran.SysTime, CAST(PartTran.SysDate as DateTime)) as time2,
*
FROM Erp.PartTran

I do prefer the simple division, shorter syntax.
However if you use DATEADD with something like PayHours it would honor 24 and + and actually get you the ‘correct’ clock out date as well. There is a time and a place for everything 
In this case division should suffice.