Those Happy Days was created on 1914-07-23.
Happy Days - book - was created in 1995.
Happy Days was created on 1974-01-15.
Happy Past Days was created on 2000-03-23.
Holly Happy Days was created on 2010-10-12.
Happy Are Those in Love was created in 1989-11.
Happy Days Are Here Again was created in 1965-03.
Those Were Wonderful Days was created in 1934.
In those days or in those happy days or in those sucessful days In my experience, it's usually spelled 'heyday'.
Happy Days - Ai Otsuka song - was created on 2004-07-07.
One of Those Days was created on 2002-10-29.
Those Were the Days - compilation album - was created in 2009.
The cast of Those Were Happy Days - 1912 includes: Baby Early Gorman as Marjorie Matty Roubert as Willy