• On the Menu bar, select View | Header and Footer.
• Check Date and time and Update Automatically (or not).
• Check Slide number.
• Check Footer and type the name of your school.
• Check Don't show on title slide.
• Click the Apply to All button.

Note: A current date for your last modification can tell everyone that your information is recent and up-to-date or assembled in haste. An old date can say that you have been prepared for some time, or your information is dated.