org-sparse-tree-default-date-type

org-sparse-tree-default-date-type is a variable defined in `org.el'.
Its value is

scheduled-or-deadline

Documentation:
The default date type when building a sparse tree.
When this is nil, a date is a scheduled or a deadline timestamp.
Otherwise, these types are allowed:

all: all timestamps
active: only active timestamps (<...>)
inactive: only inactive timestamps (<...)
scheduled: only scheduled timestamps
deadline: only deadline timestamps

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.3 of Emacs.