Doraemon: Obaachan no Omoide
English title: Doraemon: A Grandmother's Recollections
Japanese title: ドラえもん おばあちゃんの思い出
Type: Movie
Source: Unknown
Episodes: 1
Status: Finished Airing
Aired: Mar 4, 2000
Duration: 27 min
Rating: PG - Children
Studios: Shin-Ei Animation
Genres: Award Winning, Comedy, Fantasy, Sci-Fi
Demographics: Kids, Shounen

Nobita misses his granny that died a few years ago, so Doraemon takes Nobita to the past to see his grandmother one more time. But they face through a lot of things such as the younger selves of Nobita and his friends, and young Nobita's mother that doesn't recognize Nobita or Doraemon. 

(Source: Wikipedia)

The movie won the 2000 Mainichi Film Award for animation.