I am trying to use the days[] filter operator to determine whether my
custom "scheduled" date field is in the past. I have found that the days[]
operator works inconsistently with and without an argument.
- When days interval is positive,days[+N] returns "FALSE" when the date
field is more than N days in the future and "TRUE" when the date field is
within N days from today in the future *or in the past.*
- When days interval is negative, days[-N] returns "FALSE" when the date
field is more than N days in the past and "TRUE" when the date field is
within N days from today in the past *or in the future.*
- But when the days interval is 0, days[] returns "TRUE" only when the
date field is set to TODAY. It returns "FALSE" for both future and past
dates. This works to determine whether the date field is within 0 days
from today in the past, but this is incorrect for the future dates.
I'm still not sure if it's a bug or a feature. So, the days[] filter can
be used whether a date field is past N days in the future or N days in the
past, but it cannot be used to determine whether a date is past
TODAY because it returns FALSE for both future and past dates when days
interval is 0.
I suppose this behavior went unnoticed because the filter is mostly used
with "modified" and "created" fields which are always in the past.
I could not understand where the inconsistency in days.js comes from.
Perhaps, when "sigh" is 0, it is unclear whether it is 0 days in the
future or 0 days in the past.
To solve my problem, I created my own filter "passed.js" by stripping down
"days.js". "passed.js" simply returns "TRUE" when the date field is in the
past and "FALSE" when it is in the future. I do not use setHours(0,0,0,0)
there, so it takes time into account as well. It might be a useful filter
to add to TW5 permanently.
/*\
title: $:/core/modules/filters/passed.js
type: application/javascript
module-type: filteroperator
Filter operator that selects tiddlers with a specified date field in the
past.
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Export our filter function
*/
exports.passed = function(source,operator,options) {
var results = [],
fieldName = operator.suffix || "modified",
isInThePast = function(dateField) {
return new Date(dateField) < new Date();
};
if(operator.prefix === "!") {
source(function(tiddler,title) {
if(tiddler && tiddler.fields[fieldName]) {
if(!isInThePast($tw.utils.parseDate(tiddler.fields[fieldName]))) {
results.push(title);
}
}
});
} else {
source(function(tiddler,title) {
if(tiddler && tiddler.fields[fieldName]) {
if(isInThePast($tw.utils.parseDate(tiddler.fields[fieldName]))) {
results.push(title);
}
}
});
}
return results;
};
})();
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