Proposed mixed formats with digits code
level of detail full date year implied more implied
w/q/y ±CCYY-Q-WWW ±4-1-W2 -Q-WWW -1-W2
d/w/q/y ±CCYY-Q-WWW-D ±4-1-W2-1 -Q-WWW-D -1-W2-1
w/m/y ±CCYY-MM-WW ±4-2-W1 -MM-WW -2-W1 --WW --W1
d/w/m/y ±CCYY-MM-WW-D ±4-2-W1-1 -MM-WW-D -2-W1-1 --WW-D --W1-1
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