Ikiru

Ikiru (To Live) is a 1952 film by Akira Kurosawa about the death of a petty bureaucrat. Kanji Watanabe has served in a monotonous bureaucratic position in City Hall for 30 years, providing for a son who only seems to care about his money. He is seemingly content with this barely living routine, until a trip to the doctor reveals that he is dying of stomach cancer. Suddenly awakened to the meaninglessness of his life so far, Watanabe searches in vain for a way to give his life purpose, trying dissipation, hedonism and a relationship with a much younger woman before finally realizing that the key just happens to have been sitting on his own desk all along: a plan to build a playground in a poor neighborhood. Something that only someone with his skills, developed over a lifetime spent in the bureaucracy, is going to be able to get accomplished.

Considered Kurosawa's finest film to be set in contemporary Japan (most of his famous films are jidai-geki), it was the film he made right before Seven Samurai, and if not for its proximity, Ikiru would probably be held in even higher regard. As it stands, the film is considered an absolute classic from a master filmmaker, with Takashi Shimura giving the performance of his career.

Tropes used in Ikiru include:

Anachronic Order: After Watanabe finds his purpose, we jump to his funeral, and the intervening time is told in flashbacks and reminiscing.
Bittersweet Ending: Watanabe dies having finally accomplished something, but his coworkers go back to meaningless busywork. The good news is at least one of them is not pleased with this state of affairs. The seed has been sown...
The Determinator: How Watanabe manages to get the park approved, continually pestering the bureaucracy until it gives in.
Earn Your Happy Ending: Watanabe gives his last days alive tirelessly trying to get the park built, without rest. In the end, the park is built, and though Watanabe may die, he can go happily, as he now knows that he redeemed himself, and made his life matter.
Flash Back: How the process of making the park is told.
Genki Girl: Toyo certainly applies.
Go Out with a Smile: Watanabe dies, sitting on a swing in the park that he gave his last days to create, in the snow, quietly singing his favorite song to himself.
Gray Rain of Depression: Reversed, dying Watanabe is actually so happy to finally complete his quest that he cheerfully plays and whistles in a swing under a heavy rain/snow.
Let Them Die Happy: The doctors at the clinic try to cover up the cancer to do this with Watanabe, but another patient's warning about rosy diagnoses prevents that.
Obstructive Bureaucrat: The bureaucrats at City Hall, who put on a show of activity while jealously guarding their turf. Watanabe himself is one of them at the beginning of the film, which gives him the insider knowledge he uses to eventually subvert and reject this trope.
Poor Communication Kills: Watanabe consistently fails to tell his family he's dying, or that he's seeing a former subordinate. As a result, his family thinks he's seeing a gold digger, and treat him like crap even when he does try to explain things. By the time they realize the truth, he's dead.
Recycled in Space: The Death of Ivan Illych IN MODERN DAY JAPAN
Redemption Equals Death: subverted in that Wantanabe doesn't reform until he knows he is dying and specifically after his final meeting with Toya.
Sleazy Politician: The deputy mayor, who tries to take all the credit for the park he tried to quash.
- Works as a serious Crowning Moment of Heartwarming too.
Two-Act Structure: The first act being Wantanabe coming to terms with his illness and the second a posthumous re-counting at his wake of his building the park/ruminations on the man himself
Your Days Are Numbered