The Creator's 

Calendar is lunar-solar

and placed in the Heavens

 

Isaiah 66:22, 23 "For as the new heavens and the new earth Which I will make shall remain before Me, says YHVH, So shall your descendants and your name remain. And it shall come to pass That from one New Moon to another, And from one Sabbath to another, All flesh shall come to worship before Me, says YHVH."
 

Restoring the old paths of Righteousness

"Thus says YHVH: Stand in the ways and see, and ask for the old paths,
where the good way is, and walk in it;
then you will find rest for your souls..." Jeremiah 6:16