How to take only the time from a DateTime object?

Question

PHP

When executing a query, a datetime field returns an object of the datetime type with the following properties: date, timezone_type, timezone.
How to get only time? I tried to work with it as an ordinary object:
$row['STARTTIME']->{'date'}
But nothing happened, I also tried to work with it as with a regular array.
Also wanted to do this in sql query:

SELECT CAST(STARTTIME AS TIME) AS STRT FROM tableName

Ps ms sql srv 2008

Answer 1

select time(STARTTIME) as STRT from tableName

Answer 2

datepart ?