diff --git a/vlib/time/format.v b/vlib/time/format.v
index 247b8e49b1..79f913610d 100644
--- a/vlib/time/format.v
+++ b/vlib/time/format.v
@@ -20,14 +20,6 @@ pub fn (t Time) format_ss_milli() string {
 	return '${t.year:04d}-${t.month:02d}-${t.day:02d} ${t.hour:02d}:${t.minute:02d}:${t.second:02d}.${(t.nanosecond / 1_000_000):03d}'
 }
 
-// format_rfc3339 returns a date string in "YYYY-MM-DDTHH:mm:ss.123Z" format (24 hours, see https://www.rfc-editor.org/rfc/rfc3339.html)
-// RFC3339 is an Internet profile, based on the ISO 8601 standard for for representation of dates and times using the Gregorian calendar.
-// It is intended to improve consistency and interoperability, when representing and using date and time in Internet protocols.
-pub fn (t Time) format_rfc3339() string {
-	u := t.local_to_utc()
-	return '${u.year:04d}-${u.month:02d}-${u.day:02d}T${u.hour:02d}:${u.minute:02d}:${u.second:02d}.${(u.nanosecond / 1_000_000):03d}Z'
-}
-
 // format_ss_micro returns a date string in "YYYY-MM-DD HH:mm:ss.123456" format (24h).
 pub fn (t Time) format_ss_micro() string {
 	return '${t.year:04d}-${t.month:02d}-${t.day:02d} ${t.hour:02d}:${t.minute:02d}:${t.second:02d}.${(t.nanosecond / 1_000):06d}'
@@ -38,6 +30,20 @@ pub fn (t Time) format_ss_nano() string {
 	return '${t.year:04d}-${t.month:02d}-${t.day:02d} ${t.hour:02d}:${t.minute:02d}:${t.second:02d}.${t.nanosecond:09d}'
 }
 
+// format_rfc3339 returns a date string in "YYYY-MM-DDTHH:mm:ss.123Z" format (24 hours, see https://www.rfc-editor.org/rfc/rfc3339.html)
+// RFC3339 is an Internet profile, based on the ISO 8601 standard for for representation of dates and times using the Gregorian calendar.
+// It is intended to improve consistency and interoperability, when representing and using date and time in Internet protocols.
+pub fn (t Time) format_rfc3339() string {
+	u := t.local_to_utc()
+	return '${u.year:04d}-${u.month:02d}-${u.day:02d}T${u.hour:02d}:${u.minute:02d}:${u.second:02d}.${(u.nanosecond / 1_000_000):03d}Z'
+}
+
+// format_rfc3339_nano returns a date string in "YYYY-MM-DDTHH:mm:ss.123456789Z" format (24 hours, see https://www.rfc-editor.org/rfc/rfc3339.html)
+pub fn (t Time) format_rfc3339_nano() string {
+	u := t.local_to_utc()
+	return '${u.year:04d}-${u.month:02d}-${u.day:02d}T${u.hour:02d}:${u.minute:02d}:${u.second:02d}.${(u.nanosecond):09d}Z'
+}
+
 // hhmm returns a date string in "HH:mm" format (24h).
 pub fn (t Time) hhmm() string {
 	return '${t.hour:02d}:${t.minute:02d}'
diff --git a/vlib/time/time_test.v b/vlib/time/time_test.v
index 23c13351c5..6791f52e40 100644
--- a/vlib/time/time_test.v
+++ b/vlib/time/time_test.v
@@ -89,6 +89,13 @@ fn test_format_rfc3339() {
 	assert res.contains('T')
 }
 
+fn test_format_rfc3339_nano() {
+	res := time_to_test.format_rfc3339_nano()
+	assert res.ends_with('23:42.123456789Z')
+	assert res.starts_with('1980-07-1')
+	assert res.contains('T')
+}
+
 fn test_format_ss() {
 	assert '11.07.1980 21:23:42' == time_to_test.get_fmt_str(.dot, .hhmmss24, .ddmmyyyy)
 }