International Calendar/Astro formats

SMM not in Grammar yet

Constellation dates with digits code

Lunar dates
level of detail	full date		year implied
yL	±CCYYL	±4L
m/y	±CCYY-LMM	±4-L2	-LMM	-L2
	±CCYYLMM	±4L2	LMM	L2
d/m/y	±CCYY-LMM-DD	±4-L2-2	-LMM-DD	-L2-2
	±CCYYLMMDD	±4L4	LMMDD	L4
dw/m/y	±CCYY-LMM-W-D	±4-L2-1-1	-LMM-W-D	-L2-1-1
	invalid		invalid
Seasonal dates
level of detail	full date		year implied		more implied
yS	±CCYYS	±4S
q/y	±CCYY-SQ	±4-S1	-SQ	-S1
	±CCYYSQ	±4S1	SQ	S1
d/q/y	±CCYY-SQ-DD	±4-S1-2	-SQ-DD	-S1-2
	±CCYYSQDD	±4S3	SQDD	S3
m/q/y	±CCYY-SQ-M	±4-S1-1	-SQ-M	-S1-1	-S-M	-S-1
	invalid		invalid		invalid
m/y	±CCYY-SMM	±4-S2	-SMM	-S2
	±CCYYSMM	±4S2	SMM	S2
d/m/y	±CCYY-SMM-DD	±4-S2-2	-SMM-DD	-S2-2
	±CCYYSMMDD	±4S4	SMMDD	S4