Doing Edit, Paste will display the calendar, which can then be cropped and printed. Back at the Desktop, you've undoubtedly discovered that just pointing to the digital clock brings up a display of the current date and time. If your clock appears to be running behind schedule, it's probably time to replace its battery. Your owner's manual will show the location and type of battery needed, usually a lithium model that can be found at Radio Shack or anywhere watches are sold. These options replace the original date with the then current one, which may or may not be what you want.
Spreadsheet programs offer other interesting calendar options.
If, for instance, you'd like to know how many days it is from one date to another, here's how to find out. Click on an adjoining cell and type in the other date. Now highlight the two cells and go to Format, Cells, Number, General. The dates will have turned into two ordinary numbers. Subtract one from the other and you have the answer.