How to locate an element by Xpath with its dynamic title

Example: I have two images
some_date1 and some_date2 are generated dynamically.
How to locate them using CSS locator ?
click css=img[title*=’since’] : will not work because it won’t
make difference between the two images.

Here is the solution:
If you want to click on the first try this : //IMG[contains(@title,’Critical since’)][1]