Let's say I'm talking about some day in the past. In formal writing, I would use:
Earlier that day, I had lunch with my boss.
But is the following also correct?
Earlier today, I had lunch with my boss.
Clarification: I'm not talking about something that happened today (as of the date when I'm writing), but some day in the past... last week, 3 months ago, etc.
Can I still write this?
It was the 1st of April, 2006. Today had been the worst day of my life...