I did not find anything more straightforward than this:
{% for page in section.pages %}
	{% if page.date %}
		{% set page_time = page.date|date(format="%s")|int %}
		{% set curr_time = now()|date(format="%s")|int %}
		{% if page_time < curr_time %}
		Hello from the past
		{% else %}
		Hello from the future
		{% endif %}
	{% endif %}
{% endor %}
But it works.