It is suggested to introduce a new variable to add future dates in new (and
reply and forwarded if possible) e-mails for, e.g., setting deadlines. The
future date could be calculated from the date the e-mail is sent possibly by
adding a number for the days until deadline. For example: %datelocal(14)% would
create a deadline 2 weeks after the sending date.

I was thinking about whether a date switch modification function could be used
to do arithmetics on any date field - even the "atomic" ones, such as from this
[terribly long, inherited from the original Addon] list:

%A% = Day of Week (Friday)
%a% = Day of Week (Fri.)
%B% = Month (January)
%b% = Month (Jan.)
%d% = Day of Month (01 to 31) - with leading zero
%e% = Day of Month (1 to 31)
%m% = Month (01 to 12) - with leading zero
%n% = Month (1 to 12)
%Y% = Year (1970)
%M% = Minute (00 to 59)
%S% = Second (00 to 59)
%H% = Hour, 24-Hour Format (00 to 23) - with leading zero
%k% = Hour, 24-Hour Format (0 to 23)
%I% = Hour, 12-Hour Format (01 to 12) - with leading zero
%l% = Hour, 12-Hour Format (1 to 12)

We already have a "global modifier" for times, which is 
%X:=sent%
(which switches the date from current local time to the date of when the
replied-to email is sent)

We could have something like
%X:=calculated(+2)% or similar which could act as a global switch for adding 2
days to any date field displayed in the template?

Here is a test template - note that the statement
%X:=calculated(0)% 
should be used to reset the numeral day offset, otherwise it will be repeated
on every date variable

<p>Hello %from(firstname)%,</p>
<h2>Test for Deadline</h2>
<h3>Current date</h3>
<p>
%X:=today% %X:=calculated(1)% it will expire on  %dateshort%  (today+1)   [
%e%.%n%.%Y% ] <br>
%X:=today% %X:=calculated(0)% This Email was created on %dateshort% (today)  [
%e%.%n%.%Y% ]<br>
</p>
<h3>Sent date</h3>
<p>You have 1 week from your Send Date, until<br> 
%X:=sent% %X:=calculated(7)% %dateshort%  [ %e%.%n%.%Y% ] <br> 
%X:=sent% %X:=calculated(0)% Sent on: %dateshort% <br> 
</p>

Created an attachment (id=8311) [details]
1.5 prerelease 26

(From update of attachment 8311 [details])

Adds the feature for adding / subtracting day arithmetics. Syntax:

%X:=calculated(n)%


n = number of days, e.g.

n = 7 for adding a week. will modify all following date variables to result in
the calculated date.

Created an attachment (id=8312) [details]
1.5 prerelease 55

In this version the X:=calculated variable can also work on New Emails (and not
just Reply / Forward)

(In reply to comment #5)
> Created an attachment (id=8312) [details] [details]
> 1.5 prerelease 55
> 
> In this version the X:=calculated variable can also work on New Emails (and not
> just Reply / Forward)
> 

An "hours" offset was suggested for having deadlines. Ti could be added as
second parameter, such as


%X:=calculated(n,x)%

where 
x = h:m

h = offset in hours
m = offset in minutes

for example:

%X:=calculated(7,6:30)%

this would add 7 days and 6 hours 30 minutes to the time.

Setting to Resolved Fixed with official Release 1.5

Reopening for adding the time offset parameters in the next version

Created an attachment (id=8497) [details]
1.6 prerelease 86

Added second parameter

MM:SS

To add an offset of 2 days, 5 hours and 30 minutes

%X:=calculated(2,5:30)%

To reset for the rest of the Email simply add

%X:=calculated(0)%

This can be combined with the usual switches 
%X:=sent%
%X:=today%

Created an attachment (id=8498) [details]
Stationery / HTML Template

This is a template Email for testing the date variables behavior.

You can either paste the source code into a HTML view (use ThunderHTMLEdit for
this) or add it as a Stationery Template.