The original question was: does the New Moon influence lasts to the First Quarter, First Quarter to the Full Moon etc - or just on that day?
And here is my answer.
As you probably know, the Moon's phases are technically the specific angles, measured in ecliptical longitude, between the Sun and the Moon as seen from the Earth. Say, New Moon is the moment when the angle between the Sun and the Moon is 0 degrees, Full Moon - 180 degrees, First Quarter - 90 degrees, measured from the Sun, Last Quarter - 270 degrees, measured from the Sun.
This means that there is a specific moment in time when the phase is precise and its influence is most pronounced. The influence can be noticed for some time before it culminates, as well as for some time after the culmination. How …