Final answer:
From March 22 until September 22, days become longer and nights become shorter due to the Earth's tilt and orbit around the sun. This starts on the vernal equinox and ends on the autumnal equinox.
Step-by-step explanation:
From March 22 until around September 22, our days become longer and nights become shorter. This is due to the Earth's tilt on its axis and its annual journey around the sun. On March 22, the first day of spring (the vernal equinox), the hours of daylight and night are roughly equal. As the Earth continues its orbit, the tilt causes the Northern Hemisphere to receive more direct sunlight, leading to longer days. This continues until around September 22, which marks the autumnal equinox, when day and night are again roughly equal.
Learn more about Day and night cycle