Chart OFFSet how to for dynamic chart

[PCRIDE]

I have a table of data that I need to use a start and end date range, then the chart would update for that range. The challenge here is that I'm using Month names and year, i.e. January 2019 so the common offset tutorials aren't working since those use dates and add/subtract methods.

How do I use dynamic charts using Month/Year combo ?

 

[PCRIDE]

bump

The dates aren't Date, its text. I can't format as a Date i.e January 2019, mmmm yyyy as it breaks other parts of my sheet. But I do have index numbers and a look up table I can use. Any idea?