Trim from specific Character SSRS

Hi All.

I have a time measure which is displaying like this hh:mm:ss     06:52:46

so in my report I don't wanna display seconds just I wanna display  hh:mm for this I thought to write Left(field.value,5) 

but this is not right way of doing because some times we may get 120:52 (hh:mm) in this Case that Left function should't work.

Can anyone guide me how to amend my code?

Thanks in advance