白月初是东方月初吗:7years and 50days

你是从Groove Caverage的歌看到的吧，表示很长时间的俚语
7YEARS AND 50DAYS--GROOVE CAVERAGE

Seven years and fifty days
The time is passing by
Nothing in this world could be
As nice as you and I

Bridge:
And how could we break up like this
And how could we be wrong
So many years, so many days
And I still sing my song

Chorus:
Now I run to you
Like I always do
When I close my eyes
I think of you
Such a lonely girl
Such a lonely world
When I close my eyes
I dream

I'll return to you
Like I always do
When I close my eyes
I think of you
Such a lonely girl
Such a lonely world
When I close my eyes
I dream of you

Seven years and fifty days
Now just look at me
Another girl I used to be
So then what do you see

Bridge:
And how could we break up like this
And how could we be wrong
So many years, so many days
And I still sing my song

Chorus:
Now I run to you
Like I always do
When I close my eyes
I think of you
Such a lonely girl
Such a lonely world
When I close my eyes
I dream

I'll return to you
Like I always do
When I close my eyes
I think of you
Such a lonely girl
Such a lonely world
When I close my eyes
I dream of you

7年零50天是一句俚语,也是GROOVE CAVERAGE的作品.

7年50天
在文学作品中长这样用,表示一段时间,没什么含义

是句俚语。是很长时间的意思

七年零五十天