SAP HANA - How to get last index of a given string?

Hello Experts,

I need to separate the date time and time zone details from a date time string stored in a column.

Example strings are

01/02/2013 01:02:03 AEST

01/02/2013 01:02:03 EST

01/02/2013 01:02:03   IST

I want to get the last index of white space and get substring till the end. I'm not finding any method which gets me last index of a given string in HANA.

What is the correct way to get timezone info from these strings?

Thanks,
Suren.