'Days' in the Bible

I searched in my heart how to cheer my flesh with wine, my heart yet guiding me with wisdom, and how to lay hold of folly, until I might see what it was good for the sons of men that they should do under heaven all the days of their lives.

For of the wise man, even as of the fool, there is no memory for ever, since in the days to come all will have been long forgotten. Indeed, the wise man must die just like the fool!

For all his days are sorrows, and his travail is grief; yes, even in the night his heart takes no rest. This also is vanity.

All his days he also eats in darkness, he is frustrated, and has sickness and wrath.

Behold, that which I have seen to be good and proper is for one to eat and to drink, and to enjoy good in all his labor, in which he labors under the sun, all the days of his life which God has given him; for this is his portion.

For he shall not often reflect on the days of his life; because God occupies him with the joy of his heart.

If a man fathers a hundred children, and lives many years, so that the days of his years are many, but his soul is not filled with good, and moreover he has no burial; I say, that a stillborn child is better than he:

For who knows what is good for man in life, all the days of his vain life which he spends like a shadow? For who can tell a man what will be after him under the sun?

Don't say, "Why were the former days better than these?" For you do not ask wisely about this.

All this have I seen in my days of vanity: there is a righteous man who perishes in his righteousness, and there is a wicked man who lives long in his evildoing.

But it shall not be well with the wicked, neither shall he lengthen days like a shadow; because he doesn't fear God.

Then I commended mirth, because a man has no better thing under the sun, than to eat, and to drink, and to be joyful: for that will accompany him in his labor all the days of his life which God has given him under the sun.

Live joyfully with the wife whom you love all the days of your life of vanity, which he has given you under the sun, all your days of vanity: for that is your portion in life, and in your labor in which you labor under the sun.

Cast your bread on the waters; for you shall find it after many days.

Yes, if a man lives many years, let him rejoice in them all; but let him remember the days of darkness, for they shall be many. All that comes is vanity.

Rejoice, young man, in your youth, and let your heart cheer you in the days of your youth, and walk in the ways of your heart, and in the sight of your eyes; but know that for all these things God will bring you into judgment.

Remember also your Creator in the days of your youth, before the evil days come, and the years draw near, when you will say, "I have no pleasure in them;"