Plugin request: change time(zone)

Kind request, hope some smart Joplin user will come up with something:

I frequently import (copy/paste) a time table, with times HH:MM, however often it is from the wrong timezone. (for example from this page) So I manually edit the time difference to every time, for example it says 14:00 but it is 3 zones away so it needs to be 17:00.

I found a way to regex the time-notations /^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$/ from Top 15 Commonly Used Regex - Digital Fortress but replacing with an increased value does not seem to be possible in one step.

I found a way to do regex-increment-replacement in more steps Is it possible to increment numbers using regex substitution? - Stack Overflow but only just one step is possible in my Markdown editor (Typora)

Ideally there would be a plugin, where i can set my zone offset to local, and it will replace all mentioned HH:MM times within a selection, in one action.

hoping for some reactions?

cheers
Lourens