Google Calendar (Web Application)

Actions

Undo last action (if possible)

`Ctrl` + `z` or `z`

All hotkeys for Google Calendar (Web Application)

Navigation View previous/next period	`K` / `J` or `p` / `N`
Navigation Refresh view	`R`
Navigation View today	`T`
Navigation Day view	`1` or `D`
Navigation Week view	`2` or `W`
Navigation Month view	`3` or `M`
Navigation Custom view (default 4 weeks)	`4` or `X`
Navigation Agenda view	`5` or `A`
Navigation
Actions Create event	`C`
Actions Quick add event	`Q`
Actions Event details (after clicking an event's title bar)	`E`
Actions Delete event (after clicking an event's title bar)	`Backspace` or `Delete`
Actions Undo last action (if possible)	`Ctrl` + `z` or `z`
Application Focus the search box	`/`
Application Focus the add a calendar box	`Shift` + `+`
Application Print	`Ctrl` + `P`
Application Settings	`S`
Application Show list of shortcut keys	`Ctrl` + `?` or `?`

Similar combinations for other applications