When does spring start for you?
Since people like to celebrate pleasing events extensively,
spring begins several times. Thus, the meteorological spring begins on
March 1, the calendrical one on March 21, and the astronomical one takes
place this year on March 20 at 10:37 a.m. sharp.
On this day of the equinox
daytime duration is exactly 12 hours, then the days get longer and longer!