I'm similarly surprised that there's not an easier way to do this with
core. I'm not really a Javascript user generally, but I took Jed's useful
add-time.js and tweaked slightly to base it off of a base date, rather than
current date. I worry about plugins also because of making my wiki
"heavier" or future compatibility concerns, but this is super light-weight
(code is short enough I'll post below) and I don't think reliant on any
core things worth noting - so future compatibility shouldn't be an issue.
My general rule is to try to only use plugins I can understand / maintain
if necessary, so they have to be pretty dang simple. When I modified Jed's
code slightly, I have this which I add to all my wikis:
If you feel like using this, just start a new tiddler, name it something
like $:/macros/dateadd.js, change the tiddler type to
"application/javascript" and save/reload. Then, you can do stuff like:
<<dateadd basedate:"20201201" days:20">> to get 20201221. I found it useful
to continue to use YYYYMMDD notation because all of the stock dateformats
start that way, and the days filter operators work with that format.
/*\
title: $:/stobot/macros/dateadd.js
type: application/javascript
module-type: macro
Takes a base date and adds days, months or years
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Information about this macro
*/
exports.name = "dateadd";
exports.params = [
{name: "basedate"},
{name: "days"},
{name: "months"},
{name: "years"},
{name: "template"}
];
/*
Run the macro
*/
exports.run = function(basedate, days, months, years, template) {
//Make each date object.
if (basedate === "") {
var newdate = new Date();
} else {
var baseyear = basedate.substr(0,4);
var basemonth = basedate.substr(4,2);
var baseday = basedate.substr(6,2);
var newdate = new Date(Number(baseyear), Number(basemonth)-1,
Number(baseday), 0, 0, 0);
}
var new_year = Number(newdate.getFullYear())+Number(years);
var new_month = Number(newdate.getMonth())+Number(months);
var new_day = Number(newdate.getDate())+Number(days);
var output_date = new Date(new_year, new_month, new_day, 0, 0, 0);
var result = (output_date.getFullYear()*10000) +
((output_date.getMonth()+1)*100) + (output_date.getDate());
if(template === ""){
return result;
} else {
return $tw.utils.formatDateString(output_date,template);
}
};
})();
On Wednesday, December 30, 2020 at 6:50:30 PM UTC-5 TW Tones wrote:
> Soren,
>
> If you are only using it for short period such as 7-30 days, it would be
> possible to simple handle "Decembers" differently to fix the year problem.
> Or make use of the days operator.
>
> Other date tools exist, perhaps review Eric's powerful
> http://tiddlytools.com/timer.html or Evans formulae plugin.
>
> Tones
>
> On Thursday, 31 December 2020 at 10:37:59 UTC+11 Soren Bjornstad wrote:
>
>> Tones,
>>
>> Thanks! I haven't gotten around to upgrading to 5.1.23 yet, so I'll give
>> it a shot when I do. If it is unable to update the year, though, I don't
>> think it will work in this case as I'm definitely going to need to cross
>> year boundaries.
>>
>> On Tuesday, December 29, 2020 at 9:01:38 PM UTC-6 TW Tones wrote:
>>
>>> Soren,
>>>
>>> There is a new format operator for dates;
>>>
>>> Past this in a tiddler on tiddlywiki.com and see the result.
>>>
>>> Note how it seems to honor months and leap years but will not increment
>>> the year.
>>>
>>> {{{ [all[current]get[created]format:date[YYYY0MM0DD]] }}}
>>> {{{
>>> [all[current]get[created]format:date[YYYY0MM0DD]add[1]format:date[YYYY0MM0DD]]
>>>
>>> }}}
>>> {{{
>>> [all[current]get[created]format:date[YYYY0MM0DD]add[2]format:date[YYYY0MM0DD]]
>>>
>>> }}}
>>>
>>> {{{ [[20000228]format:date[YYYY0MM0DD]add[1]format:date[YYYY0MM0DD]] }}}
>>> {{{ [[20000228]format:date[YYYY0MM0DD]add[2]format:date[YYYY0MM0DD]] }}}
>>>
>>> {{{ [[20210228]format:date[YYYY0MM0DD]add[1]format:date[YYYY0MM0DD]] }}}
>>> {{{ [[20210228]format:date[YYYY0MM0DD]add[2]format:date[YYYY0MM0DD]] }}}
>>>
>>> Regards
>>> Tones
>>>
>>> On Wednesday, 30 December 2020 at 10:31:50 UTC+11 Soren Bjornstad wrote:
>>>
>>>> Hi all,
>>>>
>>>> I'm trying to use Mark S.'s solution, and it works great, except it
>>>> appears to have a minor bug in leap years: when the result would be the
>>>> 29th of February, it instead returns the 28th of February. It otherwise is
>>>> doing all of the calculations for leap years correctly (e.g., adding 2
>>>> days
>>>> on February 28, 2020 returns March 1, 2020).
>>>>
>>>> I have to admit I have pretty much no clue what's going on with those
>>>> filters, lol, so if someone is able to spot the issue I'd be much obliged.
>>>>
>>>> On Tuesday, October 22, 2019 at 3:00:28 AM UTC-5 Mat wrote:
>>>>
>>>>> Cool stuff Mark!
>>>>>
>>>>> Date manipulation is one of those border areas that you seemingly will
>>>>> never need... until you do. So thanks for sharing Mark.
>>>>>
>>>>> <:-)
>>>>>
>>>>
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