It went into effect at 8:00AM Local Time, which was 1:00AM Eastern Time.
The Israeli military says it withdrew all of its troops from Gaza ahead of the ceasefire.
At least 20 rockets were fired from Gaza into Israel just minutes before the truce went into effect.
Only 20 minutes beforehand, an airstrike hit the southern part Gaza City.
Egypt is set to hold talks over the next three days to work out a long-term truce.