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The phrase "halcyon days" is correct and usable in written English.
It is typically used to refer to a time in the past that was characterized by happiness, tranquility, and prosperity. For example, you could say "The halcyon days of high school will always be remembered fondly."
Dictionary
halcyon days
noun
Period of calm during the winter, when storms do not occur.
Exact(59)
"Halcyon Days".
The halcyon days.
Those halcyon days are over.
These halcyon days lasted barely a decade.
THESE are halcyon days for military contractors.
Halcyon days could not be counted on.
Remember the halcyon days of December 2003?
Those halcyon days are a distant memory.
Still, his speech referred to those halcyon days.
These are not halcyon days for the private equity industry.
The halcyon days of private equity appear far distant.
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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