Day one antonyms

What is the opposite word for Day one?

• ending

  beginning, start of an event or action
• conclusion

  beginning, start of an event or action
• end

  beginning, start of an event or action
• close

  beginning, start of an event or action
• finish

  start of an event or action, beginning
• death
• completion
• finale
• termination
• stop
• result
• epilogue
• consummation
• goal
• outcome
• effect
• destiny
• exit
• consequence
• outgrowth
• coming
• disadvantage
• arrival
• omega
• epilog
• cessation
• closing
• closure
• period
• windup