'during the day' is correct and usable in written English. It is used in a sentence to explain when something happens, usually during a specific day. For example: "I often work late into the evening, but during the day I like to relax and recharge."
(Most duikers are active during the day).
Typical herons feed during the day.
Many others followed during the day.
And during the day.
during the day.
"The men train during the day.
We kill ourselves during the day.
He only sleeps during the day".
Do not nap during the day.
"There is nobody there during the day.
Looting and thefts during the day.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com