Heyday-Hayday | Commonly Confused Words

Heyday

/ˈheɪdeɪ/

The period of greatest success and prosperity

/ˈheɪˌdeɪ/

A period of great success, popularity, or power.

Heyday is used to refer to the peak or prime period of something.
Hayday is often mistakenly used but it is not recognized as a standard word in English.
Remember that hey is a greeting, like in Hey, youre in your prime!, which can help connect heyday' to its meaning of a peak period.
The correct spelling is heyday, similar to the phrase hey, look at my day! to signify the best times.
Theres no hay in prime time, so keep heyday' as your go-to term.