org-time-stamp-formats

org-time-stamp-formats is a variable defined in `org.el'.
Its value is

("<%Y-%m-%d %a>" . "<%Y-%m-%d %a %H:%M>")

• This variable may be risky if used as a file-local variable.

Documentation:
Formats for `format-time-string' which are used for time stamps.
It is not recommended to change this constant.