🎨 New template functions ISOYear, ISOMonth and ISOWeekDate https://github.com/siyuan-note/siyuan/issues/15679

kernel/filesys/template.go

@@ -46,6 +46,7 @@ func BuiltInTemplateFuncs() (ret template.FuncMap) {
 	ret["ISOWeek"] = util.ISOWeek
 	ret["ISOYear"] = util.ISOYear
 	ret["ISOMonth"] = util.ISOMonth
+	ret["ISOWeekDate"] = util.ISOWeekDate
 	ret["pow"] = pow
 	ret["powf"] = powf
 	ret["log"] = log

kernel/util/time.go

@@ -80,6 +80,19 @@ func ISOMonth(date time.Time) int {
 	return int(monday.Month())
 }
 
+// ISOWeekDate returns the date of the specified day of the week in the ISO 8601 week of date.
+// day: Monday=1, ..., Sunday=7.
+func ISOWeekDate(date time.Time, day int) time.Time {
+	weekday := int(date.Weekday())
+	if weekday == 0 {
+		weekday = 7
+	}
+
+	daysToMonday := weekday - 1
+	monday := date.AddDate(0, 0, -daysToMonday)
+	return monday.AddDate(0, 0, day-1)
+}
+
 func Millisecond2Time(t int64) time.Time {
 	sec := t / 1000
 	msec := t % 1000