You can define placeholder text in Pages v5.5.2 in any of the six header/footer sections. Think of it as a a field code that when you click on it the text you enter replaces the placeholder text using the same style. By example, I placed a combination of text and placeholder text in the lower left footer segment.
The text and the brackets were selected, and then Format ▸ Advanced ▸ Define as Placeholder Text. Also, because it is in the footer, it is replicated throughout the document. Although you could Insert > Date/Time into this placeholder text, automation may be preferred. I have chosen to use the same date/time style as MS Word uses in its print date field code. You can only change placeholder text programmatically with Pages and AppleScript on Yosemite. Once I run the AppleScript, all placeholder tags are replaced as shown in this image:
You could make this an Automator Service (e.g. run AppleScript action with no input, and output replacement is checked). One could assign a keyboard shortcut to this service too. One click printed date stamp and document sent to default printer.
The AppleScript (Yosemite only).
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property tagStr : "[print-date]"
--- used for testing ---
-- set f to POSIX path of ((path to desktop) as text) & "arg.pages"
-- set hf to POSIX filef as alias
--------------------
set printDate to "" as text
set theTags to {}
tell application "Pages"
activate
-- openhf
tell front document
set theTags to the tag of every placeholder text whose tag is equal to tagStr
-- Word print-date field code uses this 12-hour date/time format as mm/dd/YY 00:00 AM/PM
set printDate to do shell script ("/bin/date +'%D %l:%M %p'") as text
repeat with i from 1 to count of theseTags
set thisTag to itemi of theseTags
set (every placeholder text whose tag is thisTag) to printDate
end repeat
-- use your own System Preferences printer name string
tell application "Samsung ML-2950 Series (Sammy)"
activate
-- no print dialog
print front document without «class pdlg»
quit
end tell
end tell
-- close front documentsavingno
end tell