Each league has different rules regarding this. You will need to contact your league to find out.
D-Day was the first day of "Operation overlord".
1970
SUNDAY
December 21/22 is the official first day of winter
The official date of the First day of Spring in the Southern Hemisphere is September 22nd or 23rd.
December 21 is the official day of winter.
The first day of Autumn, or the Autumnal Equinox
December 21/22 is the official day of winter.
While it is possible that individual Adventist churches dedicate their choir's robes, this is not an official practice of the Adventist Church.
Northern Hemisphere:Saturday, March 20, 2010, was the official first day of spring for 2010 in the Northern Hemisphere. The Vernal Equinox occurred at 17:32 UTC. On that day, the Southern Hemisphere observed the Autumnal Equinox, which is the equivalent of the start of Autumn.Southern HemisphereThe official date of spring south of the equator (corresponding to the first official day of fall in places north of the equator) was September 23, 2010. (03:09 UTC)Countries such as Australia and New Zealand, however, designate the first day of September as the official first day of spring.
October 12
October 15, 2010