"Summer Days" is a song written by Tony Romeo. The song was originally recorded in 1971 by The Partridge Family on their "Sound Magazine" album, but was not released as a single.
Lou Christie cover.
Lou Christie recorded "Summer Days" in 1975. It was released as a non-album single. 
The song reached No. 89 on the "Record World" chart and No. 112 on "Cash Box".
Other versions.
David Cassidy recorded a solo version of "Summer Days" on his 1973 LP "Dreams Are Nuthin' More Than Wishes".
References.
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