Read Datetime from txt File For X axis

I have datetime my txt file like this:
gunler.txt (3.4 KB)
And my graph x axis shoul created for this txt file
How can read it and draw it

What does the rest of your data look like? You may need to convert the first column to something ROOT understands. I’m not sure ROOT will be able to read your dates in this particular format.

You can use strptime:

tm t;
if (!strptime("2010-May-01/00:30:00.000", "%Y-%b-%d/%H:%M:%S.000", &t)) { 
   // FAILED, handle error
} else {
   // the timestamp is in variable t

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