day one

(often initial capital letters) the very first day or beginning of something.

1975–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

day one definition

  1. n.
    the first day. (Often with since.) : You haven't done anything right since day one! You're fired!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Day one of our visit will close with a dinner with our traveling party.
It's also unique because it's the first mud volcano that scientists have
  observed from day one.
One day one of my co-teachers came into the teachers' office area with two
  small plastic containers.
They have known how damaging these drugs are from day one.
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