Custom query based on post date

Hi,
I’m creating an events site. Every post is an event.
I need to modify the post query for extracting just the posts with date (date and time) equal or major than the current date and time.
for future time events publishing I’m using “the future is now” plugin
e.g today 29 feb. at 3 p.m I visit the “today’s events” page, I have to see all the events from 3 p.m to 11:59 p.m
thanks in advance