be new, it has not been long since, still in the early days of, not many days have passed since

Sabbath (Biblical seventh day)

Sabbath (Biblical seventh day)

Sabbath (Biblical seventh day)

anniversary (day an exact number of years since an event)

Human day; also known as 七草(ななくさ)の節句(せっく) (nanakusanosekku, “the festival of seven herbs”); one of the five seasonal festivals (五節句 (gosekku). It is celebrated on January 7.

man-day

(archaic, possibly obsolete) two days, a two-day period

Saturday

a lucky day, auspicious day