I am wondering how to use the phrase ‘as of’ correctly. I learnt from my daily email communications with native English speakers that the phrase could mean “from”, “on/at” or “by the end of”. However, the last sense was not found in Oxford English Dictionary or Merriam Webster’s online edition.
That made me quite puzzled. Examples may speak louder than theories.
“As of yesterday, we had finished three tasks.”
Is this usage correct and does it mean the same thing as “by the end of yesterday, we had finished three tasks”?