I generate a list of dates from a dictionary-tiddler. With which filter-spell can I find out what day is a saturday to add a special icon?
And how can I filter a list of dates for dates in the future?
Assuming your date values are formatted as “YYYY0MM0DD”:
<$let when=<<now YYYY0MM0DD>> fmt="[UTC]DDD" saturday={{$:/language/Date/Long/Day/6}}>
<$list filter="[<when>format:date<fmt>match<saturday>]">
{{SaturdayIcon}}
</$list>
Notes:
- In this example, the value of
whenis generated via the<<now>>macro. For your purposes, this value would be generated from your dictionary tiddler instead. -
[UTC]DDDis used to get the day name from the date value. The[UTC]prefix is needed to preventformat:datefrom applying a timezone offset adjustment to the date input value. - You can’t use square brackets within a literal filter operand (i.e.,
[[UTC]DDD]), so thefmtvariable is used as a workaround in order to specify “[UTC]” as part of the date format operand. - Getting the day name from
$:/language/Date/Long/Day/6allows the comparison to work for any language setting.
Assuming the index names in your dictionary tiddler are formatted as “YYYY0MM0DD”:
<$let dates="MyDateDictionary" today=<<now "[UTC]YYYY0MM0DD">>>
<$list filter="[<dates>indexes[]compare:date:gt<today>]">
{{{ [<dates>getindex<currentTiddler>] }}}<br>
</$list>
</$let>
Notes:
- The
$listfilter gets all the index names and then filters for only those names that are greater than the current date. This works because “YYYY0MM0DD” is always a strictly ascending value, so all future dates are always greater than the current date. - For purposes of this example, the
$listoutput simply shows the index value for each future date. Your specific use-case may be different.
enjoy,
-e
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