Convert MST to GMT timezone

I want to create a Smartapp and to convert date and time which is in MST format to GMT+3

The string I want to parse is in format:
“2020-09-12 03:16:45” (MST)
And I want to convert it to:
“2020-09-12 13:16:45” (GMT+3)

Is there any library to use within my Smartapp to do this?

No but you can do it using java/groovy libraries. You can google for the details, I believe you can z or Z:

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