Two series linechart with time offset

I have 2 data source
first one's data is for from: now-1w / to: now
second one is from: now-2w / to: now-1

I want to visualize both of them in one line chart.
y axis is ratio and it's clear.
but how can i define x axis to load both of series in 1 chart? how can set x axis to Date-Time?

my challenge is how to define X axis to draw this 2 line on each other to compare differences. because our times are not same.

You can accomplish with TSVB
First add your 1st series / data set.
Then add your second data set and go into the options and change add the new index, offeset etc.