yup, just a data/time stamp, so you can see when the screenshot was taken.
The other letters are just the char_id in a letter form.
0 => R
1 => O
2 => H
3 => U
4 => T
5 => N
6 => A
7 => S
8 => E
9 => W
you could use this to verify who took the screenshot.
but now i have published the mega complex algorithm used, you should no longer trust this information.
and Gravity Korea will be manhunting me for telling you all this, i doubt i will last a few days /sadface