how to extract time from datetime column

Hi

i need to extract time from datetime column:-

tried to_char('1900-01-01 19:10:00.000','HH:MM:SS') but it is showing NULL

cast('1900-01-01 19:10:00.000','time') but it is showing full datetime in column

for eg:- 1900-01-01 19:10:00.000

result expected :- 19:10:00.000

regards