Hi, question: How can i put the image of the calendar in this window?

[acg3fly]

Hi, how can i get the same image of the calendar that appears when we click on the date/hour in the task bar (image on left) in the window that appears when we try to change the date/hour (image on right), i see some themes that they have the same image for both windows and i can´t find how, i hope somebody can help me, thanks59297