The phrase "productive day" is correct and can be used in written English. Example sentence: Today has been a very productive day; I have been able to complete all of my tasks and formulate a plan to tackle future projects.
"I don't anticipate it being a productive day".
"It's been a good and productive day for us.
It has been a long but productive day.
I would say that this is the least productive day Cyprus ever had.
I don't know about you, but I'm having a really relaxing, productive day.
"I had a very productive day, but I don't know if that was why," he says.
Last weekend's Discotech event in Cambridge was a very productive day for us.
Productive Day on Monroe Street, and great effort by all who attended!
Blackouts take the Internet down with them, along with any hope for a productive day.
It was turning out to be a productive day for England's clubs on their various jaunts into Europe.
In effect, working to feel productive day-to-day means sacrificing anything worth being productive for.
I love the desktop app, it’s always running on my Mac. Ludwig is the best English buddy, it answers my 100 queries per day and stays cool.
Cristina Valenza
Retail Lead Linguist @ Apple Inc.