cheat sheets.

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Timestamps
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prompt for date and insert timestamp              C-c .
like C-c . but insert date and time format        C-u C-c .
like C-c . but make stamp inactive                C-c !
insert DEADLINE timestamp                         C-c C-d
insert SCHEDULED timestamp                        C-c C-s
create sparse tree with all deadlines due         C-c C-w
the time between 2 dates in a time range          C-c C-y
change timestamp at cursor by ±1 day              S-RIGHT/LEFT [3]
change year/month/day at cursor by ±1             S-UP/DOWN [3]
access the calendar for the current date          C-c >
insert timestamp matching date in calendar        C-c <
access agenda for current date                    C-c C-o
select date while prompted                        mouse-1/RET
toggle custom format display for dates/times      C-c C-x C-t

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Clocking time
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start clock on current item                       C-c C-x C-i
stop clock on current item                        C-c C-x C-o
cancel current clock                              C-c C-x C-x
display total subtree times                       C-c C-x C-d
remove displayed times                            C-c C-c
insert/update table with clock report             C-c C-x C-r