org-timestamp-change

org-timestamp-change is a compiled Lisp function in `org.el'.

(org-timestamp-change N &optional WHAT UPDOWN SUPPRESS-TMP-DELAY)

Change the date in the time stamp at point.
The date will be changed by N times WHAT. WHAT can be `day', `month',
`year', `minute', `second'. If WHAT is not given, the cursor position
in the timestamp determines what will be changed.
When SUPPRESS-TMP-DELAY is non-nil, suppress delays like "--2d".