expression
this very day; today for sure; today is the day
Emphasizes that today is the decisive or long-awaited day when something must happen or finally happens. Often used with a sense of determination or inevitability.
今日という今日は絶対に宿題を終わらせる。
Today for sure I will finish my homework.
今日という今日こそ、彼に本当のことを言おう。
Today is the day I will tell him the truth.