For reference, Isaiah 45:7 (NET Bible translation):
I am the one who forms light
and creates darkness;14
the one who brings about peace
and creates calamity.15
14tn On the surface v. 7a appears to describe God’s sovereign control over the cycle of day and night, but the following statement suggests that “light” and “darkness” symbolize “deliverance” and “judgment.”
15sn This verses affirms that God is ultimately sovereign over his world, including mankind and nations. In accordance with his sovereign will, he can cause wars to cease and peace to predominate (as he was about to do for his exiled people through Cyrus), or he can bring disaster and judgment on nations (as he was about to do to Babylon through Cyrus).