[tw] Re: [TWC] DatePlugin question
On Tuesday, June 23, 2015 at 8:00:35 AM UTC-7, jpt wrote:
Using a suggestion that was made in this group I am able to display a
tiddler titled with a specific date (20150623 for example) by writing
this:
tiddler {{(newDate()).formatString ('0MM0DD')}}
However I can not figure out how to format it so it displays a tiddler
with a date other than today, e.g. tomorrow's date.
I also tried the DatePlugin and wrote this:
tiddler {{showDate(Y M D+1 0MM0DD}}
but it gives me an error message.
What am I doing wrong?
I'll answer the second part first:
* In TWC, macros don't generate text output. They generate and render DOM
elements. Thus, you cannot use the output of a macro as a parameter of
another macro.
* In TW5, macros are used to assemble text output and the returned value
can, with syntax limitations, be used as a parameter of another macro.
Now on to the real tech:
new Date() returns the current date/time in milliseconds since midnight
on Jan. 1, 1970 (the start of time, computationally speaking!). As you've
learned, this value can then be formatted using .formatString
('0MM0DD').
To use a date other than the current one, pass the number of milliseconds
into the Date() function. For example, if you use new
Date(0).formatString(...), you will see 19700101. (note: the date is
adjusted for your local time zone, so if you are west of UDT, the start
date will show as 19691231)
You can calculate a new value from the current date/time value by
adding/subtracting the appropriate number of milliseconds. For example,
one day is 8640 milliseconds (60 x 60 x 24 x 1000). Thus, to get
tomorrow's date, you would use new Date() + 8640 as the input param,
like this:
new Date(new Date() + 8640).formatString('0MM0DD 0hh:0mm:0ss');
enjoy,
-e
Eric Shulman
ELS Design Studios
TiddlyTools - Small Tools for Big Ideas!
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[tw] Re: [TWC] DatePlugin question
Thank you.
I understand now that in TWC macros generate and render DOM elements and
cannot be used as parameters for other macros.
For whatever reason I still have trouble with the code.
When I write tiddler {{(new Date(new Date() +
8640).formatString('0MM0DD')}} it gives me Error in macro
tiddler.
To try to see if I missed something I used the WriteIt Plugin and all of
the following lines display correctly:
writeIt {{(new Date()).formatString('0MM0DD') gives 20150623
(today's date);
writeIt {{(new Date(0)).formatString('0MM0DD') gives 19691231 (as
mentioned in the answer);
writeIt {{(new Date(0 + 8640)).formatString('0MM0DD') gives
19700101.
However when I write:
writeIt {{(new Date(new Date() + 8640)).formatString('0MM0DD')
I get *NaNNaNNaN*.
What did I miss?
Regards,
Johannes
On Tuesday, June 23, 2015 at 11:00:35 AM UTC-4, jpt wrote:
Hello,
Using a suggestion that was made in this group I am able to display a
tiddler titled with a specific date (20150623 for example) by writing
this:
tiddler {{(newDate()).formatString ('0MM0DD')}}
However I can not figure out how to format it so it displays a tiddler
with a date other than today, e.g. tomorrow's date.
I also tried the DatePlugin and wrote this:
tiddler {{showDate(Y M D+1 0MM0DD}}
but it gives me an error message.
What am I doing wrong?
Best,
Johannes
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[tw] Re: [TWC] DatePlugin question
On Tuesday, June 23, 2015 at 10:32:54 AM UTC-7, jpt wrote:
For whatever reason I still have trouble with the code.
When I write tiddler {{(new Date(new Date() +
8640).formatString('0MM0DD')}} it gives me Error in macro
tiddler.
What did I miss?
You have an extra open parentheses, just before the first new.
Note also, when you see the red error in macro, if you click on the
message, it shows more details.
-e
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[tw] Re: [TWC] DatePlugin question
Dear Mr Shulman,
Thank you very much!
It got me in the right direction.
Still was not able to get tomorrow's tiddler displayed no matter that the
error message disappeared.
Until I read somewhere to put a + in front of the second new Date.
Like so: tiddler {{new Date(+ new Date() +
8640).formatString('0MM0DD')}}
Seems that this new Date was interpreted as something other than a number
(which would explain the NaN output).
Can that be or is something else wrong and the + handling it is just a
fluke?
It now works perfectly and I can add and subtract days as I please.
Thank you very much.
Johannes
On Tuesday, June 23, 2015 at 11:00:35 AM UTC-4, jpt wrote:
Hello,
Using a suggestion that was made in this group I am able to display a
tiddler titled with a specific date (20150623 for example) by writing
this:
tiddler {{(newDate()).formatString ('0MM0DD')}}
However I can not figure out how to format it so it displays a tiddler
with a date other than today, e.g. tomorrow's date.
I also tried the DatePlugin and wrote this:
tiddler {{showDate(Y M D+1 0MM0DD}}
but it gives me an error message.
What am I doing wrong?
Best,
Johannes
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