What is the antonym of "beautiful day"?

The antonym of a good day is a good day.

It means a good time, an auspicious day, that is, an auspicious idea, and is often used to address a suitable wedding day. Although this statement has superstitious elements, it is undeniable that it has become a custom.

This word comes from Chu Quyuan's Nine Songs of the Eastern Emperor Taiyi in the Warring States Period.

The original sentence: "The ecliptic is auspicious, and Mu Bixi is God."

The moral is: auspicious days are beautiful moments, respectful worship of God and solemn worship.