How to: Edit date and/or time in master placeholder.
Solution:
Type a date and/or time in the 'Date Area' placeholder , in 'Slide Master' view.
1) Move to 'Slide Master' view:
a) Select the 'View' menu and select 'Master'. (The Master submenu appears.)
b) Select 'Slide Master'. (The Slide Master slide appears.)
2) Select the 'Date Area' placeholder . (Handles appear around the selection box.)
Date Area placeholder
3) Type the desired date and/or time:
a) Select (highlight) '(date/time)' in the placeholder.
b) Select the 'Insert' menu and select 'Date and Time...'. (The Date and Time dialog box appears.)
c) Select the desired format from the 'Available Formats' list.
Available Formats
d) Click 'OK'.
4) (Optional) Move the 'Date Area' placeholder to the desired location.
5) Click on a blank area to deselect the placeholder.
6) To return to slide view, select the 'View' menu and select 'Slides'.