For the day of vengeance is in mine heart, and the year of my redeemed is come.
For the day of vengeance (is) in mine heart. "Is" - rather, was. This assigns the reason why He has thus destroyed the foe (Zephaniah 3:8).
The year of my redeemed - of my people to be redeemed.
Day ... year - here, as in Isaiah 34:8; Isaiah 41:2, the time of "vengeance" is described as a "day" - that of grace and of 'recompence' to the "redeemed," as a "year." God delights in grace, rather than in vengeance.