Key	Description	Mnemonic
[C-u] C-c .	Add or set active date[-time] stamp	point in time
[C-u] C-c !	Add or set inactive date[-time] stamp
[C-u] C-c C-s	Set [or remove] SCHEDULED timestamp	schedule
[C-u] C-c C-d	Set [or remove] DEADLINE timestamp	deadline

To create a date/time range, type C-c . immediately after the creation or change of a timestamp.

Time range:

Org uses and extends the Emacs calendar for date/time entry.

Key	Description
C-v	next 3 months in the calendar
M-v	previous 3 months in the calendar
C-.	go to today

Org pre-selects today as the selected date. To confirm the selected date, type RET. To specify some other date, enter yyyy-mm-dd for year yyyy, month mm, and day dd, as per ISO 8601. To specify a date relative to the selected date, enter a query per the table below.

Query	Description
yyyy-mm-dd	on day yyyy-mm-dd
hh:mm	at time hh:mm
hh:mm-hh:mm	from hh:mm to hh:mm
hh:mm+t	from hh:mm to t hours after
hh:mm+tu	form hh:mm to t units u after
d	closest future day d
m-d	closest future day d in month m
mon	closest mon-day in the future
-mon	closest mon-day in the past
Nmon	N-th closest mon-day in the future
-Nmon	N-th closest mon-day in the past
+N	N days in the future
-N	N days in the past
+Nw	N weeks in the future
-Nw	N weeks in the past

Org outputs the matching date and indicates the future with (=>F). To specify the time, append h:m for h hours and m minutes.

To repeat, write

"<" YYYY "-" MM "-" DD " " ddd [" " HH ":" MM ["-" HH ":" MM]] RNU ">"

where	R	denotes the repeater type,
	N	denotes the number of units, and
	U	denotes the unit.

For the repeater type R, + repeats N units U after the original date, .+ repeats N units U after marked done, and ++ repeats after kN units U after the original date with the least positive k that falls into the future. For the unit U, y represents a year, m a month, w a week, d a day, and h an hour.

For more complicated queries, use the diary- functions. For example, the 3rd Saturday every month is <%%(diary-float t 6 3)>.