gramie , 1 month ago

In Japan, every day in the calendar has a “luck” associated with it. Weddings and other important events are always scheduled for good luck days, and bad luck days are avoided. Certain years of your life are also better or worse (eg. a woman’s 31st year might be unlucky.

At least, that’s how it was d when I lived there 25 years ago. I also think this system may have been adopted from China.