%A

exdates in iCalendar format (semicolon-separated list of ISO 8601 date strings listing dates to exclude)

%a

rdates in iCalendar format (semicolon-separated list of ISO 8601 date strings listing recurrence dates)

%B

start time (also see %Z)

%C

create time 

%c

task class 

%D

due date and time. 

%d

task description. (also see %F)

%E

due date and time in IMIP format 

%e

exception rules in iCalendar format 

%F

task description - folded line, iCalendar format (also see %d)

%G

this task's geographic location, the latitude and longitude. 

%g

organizer's email address (cannot guarantee the authenticity of this value) 

%K

organizer’s email in the form of a mailto:URL

%k

alarm count 

%L

the location 

%l

recurrence rules in iCalendar format 

%M

modify time 

%N

a new line 

%n

"now" (the current time stamp and used with DTSTAMP)

%P

priority 

%r

the recurrence ID (blank if this task does not recur) 

%S

is the task’s Sequence Number 

%s

summary 

%t

the status 

%U

the UID

%Z

used in conjunction with time field code to force the time to be rendered in UTC (%B displays the start time in local time whereas %ZB displays the start time in UTC time)

%%

displays the % character

% (sub-format code)

specify a sub-format for the data identified by code (for details, see E.4.3 Calendar Server Notifications Date Sub-Format Strings)