Ok, for sake of completion, and for anyone else who might be looking
for this someday, here's what worked for me. Its a modification of
something Udo B wrote for someone a while back, and FND recently
helped me with the rounding. So someone with a Date of Birth
2000-01-01 should read as 9.4 years old.
Its a FET that looks at the date of birth which is stored in the title
of a tiddler, and that tiddler has a tag called "Age" (which for
convenience I've also titled the tiddler that contains this FET.:
<<forEachTiddler
where
'tiddler.tags.contains("Age")'
sortBy
'(tiddler.title)'
script '
// Returns the first line of the string
//
function getFirstLine(s) {
var m = s.match(/\s*(.*)/);
return m != null && m.length >= 1 ? m[1] : "";
}
// Returns the number of days between two dates.
//
// Only the year,month and day of the dates are considered.
//
// if date2 < date1 the result will be negative.
//
function getDaysBetween(date1, date2) {
date1 = new
Date(date1.getFullYear(),date1.getMonth(),date1.getDate
());
date2 = new
Date(date2.getFullYear(),date2.getMonth(),date2.getDate
());
return ((date2.getTime()-date1)/86400000).toFixed();
}
// Returns the date given by the string s
//
// @param s String of format YYYY-MM-DD ("-" may be
any char)
// @param defaultValue returned when s is not a valid date.
//
// @return a Date object representing the given date.
//
function parseDate(s, defaultValue) {
try {
return new Date(parseInt(s.substr(0,4),10),
parseInt(s.substr(5,2),10)-1,
parseInt(s.substr(8,2),10));
} catch(e) {
return defaultValue;
}
}
function getYearsLeftText(tiddler) {
return Math.round(((getDaysBetween(new Date(),parseDate
(tiddler.title, new Date())))/-365)*10)/10+" years old";
}
'
write
'getYearsLeftText(tiddler)+"\n"'
>>
-Dave
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