The vernal equinox occurs on the 19th at 11:50 pm EDT. This moment marks the instant when the ecliptic longitude of the Sun reaches zero degrees and begins another circuit around the sky. This is the earliest occurrence of the equinox since the year 1896, and we will continue to see equinoxes on the 19th (in EDT) every four years through the year 2096.
[T]he actual day of “equilux” occurred on March 16th. From now until the next “equilux” day on September 25th we will have more daylight than darkness.