| Calendar Days | |
| Type: | studio |
| Artist: | The Rocket Summer |
| Cover: | therocketsummer_cd.jpg |
| Released: | February 8, 2003 |
| Recorded: | July–August 2002 at: Red House Recording (Eudora, KS, United States) |
| Genre: | Alternative rock |
| Length: | 38:46 (United States/UK) 43:06 (JP) |
| Label: | The Militia Group |
| Producer: | Bryce Avary |
| Prev Title: | The Rocket Summer (EP) |
| Prev Year: | 2000 |
| Next Title: | Hello, Good Friend |
| Next Year: | 2005 |
Calendar Days is The Rocket Summer's first full-length album, released in 2003. In Japan, this album included a bonus track titled "She's a Seven" which was later released in the US on The Early Years EP. The album title comes from the track "TV Family".