From d684bb41b17fcbe2943070c98a6ea670e9eb010e Mon Sep 17 00:00:00 2001
From: Daniel <845765@qq.com>
Date: Tue, 26 Aug 2025 21:16:34 +0800
Subject: [PATCH] :art: New template functions `ISOYear` and `ISOMonth`
 https://github.com/siyuan-note/siyuan/issues/15679

---
 kernel/filesys/template.go |  2 ++
 kernel/util/time.go        | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/kernel/filesys/template.go b/kernel/filesys/template.go
index 9acaa54fc..3184da077 100644
--- a/kernel/filesys/template.go
+++ b/kernel/filesys/template.go
@@ -44,6 +44,8 @@ func BuiltInTemplateFuncs() (ret template.FuncMap) {
 	ret["WeekdayCN"] = util.WeekdayCN
 	ret["WeekdayCN2"] = util.WeekdayCN2
 	ret["ISOWeek"] = util.ISOWeek
+	ret["ISOYear"] = util.ISOYear
+	ret["ISOMonth"] = util.ISOMonth
 	ret["pow"] = pow
 	ret["powf"] = powf
 	ret["log"] = log
diff --git a/kernel/util/time.go b/kernel/util/time.go
index bd9fad5ea..5a49b88d6 100644
--- a/kernel/util/time.go
+++ b/kernel/util/time.go
@@ -62,6 +62,21 @@ func ISOWeek(date time.Time) int {
 	return week
 }
 
+// ISOYear returns the ISO 8601 year in which date occurs.
+func ISOYear(date time.Time) int {
+	year, _ := date.ISOWeek()
+	return year
+}
+
+// ISOMonth returns the month in which the first day of the ISO 8601 week of date occurs.
+func ISOMonth(date time.Time) int {
+	year, week := date.ISOWeek()
+	// ISO 8601 week starts from Monday
+	isoWeekStart := time.Date(year, 0, (week-1)*7+
+		1-(int(time.Date(year, 0, (week-1)*7+1, 0, 0, 0, 0, time.Local).Weekday())+6)%7, 0, 0, 0, 0, time.Local)
+	return int(isoWeekStart.Month())
+}
+
 func Millisecond2Time(t int64) time.Time {
 	sec := t / 1000
 	msec := t % 1000