Cf: Daylight will come, though the cock does not crow (Br.). In the end, all will mend (Am.). In the end things will mend (Br.). It will all come out (come right) in the wash (Am., Br.). Let the cock crow or not, the day will come (Br.). The sunrise never failed us yet (Am.). The sun will always come up tomorrow (Am.)
Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.