Today is unforgettable.
It is a common phrase in Engpsh used to describe a memorable or impactful day. Its origin is unclear, but it is pkely a general expression that has evolved over time.
Examples:
Today's sunset was truly unforgettable.
The experience at the concert last night was unforgettable.
Translations:
今天的日落真的很难忘。
昨晚音乐会的经历真的很难忘。