Thank you so . This refrain has been drumming through my head for weeks.
Now I can hold forth while driving my car giving this hymn all of its age-old respect and glory.
Mac Brown

Thanks - I am doing a program of the day: dawning, morning, noon, afternoon, evening, night. Could not think of the hymn with these words

I think this is what you're looking for: it's by H.Ernest Nichol:

Lyrics to 'We've a Story to Tell to the Nations'

1. We've a story to tell to the nations,
that shall turn their hearts to the right,
a story of truth and mercy,
a story of peace and light,
a story of peace and light.

Refrain:
For the darkness shall turn to dawning,
and the dawning to noonday bright;
and Christ's great kingdom shall come on earth,
the kingdom of love and light.

2. We've a song to be sung to the nations,
that shall lift their hearts to the Lord,
a song that shall conquer evil
and shatter the spear and sword,
and shatter the spear and sword.
(Refrain)

3. We've a message to give to the nations,
that the Lord who reigneth above
hath sent us his Son to save us,
and show us that God is love,
and show us that God is love.
(Refrain)

4. We've a Savior to show to the nations,
who the path of sorrow hath trod,
that all of the world's great peoples
might come to the truth of God,
might come to the truth of God.
(Refrain)

Looking for name of hymn with this refrian: when the darkness turns to the dawning, and the dawning to noonday bright, then Christ's great kingdom shall come to earth, the kingdom of love and light