but it shall be one day which is known unto Jehovah; not day, and not night; but it shall come to pass, that at evening time there shall be light.

And it will be unbroken day, such as the Lord has knowledge of, without change of day and night, and even at nightfall it will be light.

αλλα θελει εισθαι μια ημερα, ητις ειναι γνωστη εις τον Κυριον, ουτε ημερα ουτε νυξ· και προς την εσπεραν θελει εισθαι φως.

But it shall be one day which shall be known to the Lord, not day, nor night: but it shall come to pass, that at evening time it shall be light.