diff --git a/core/time/rfc3339.odin b/core/time/rfc3339.odin
index a4d03789d..0a2d431b7 100644
--- a/core/time/rfc3339.odin
+++ b/core/time/rfc3339.odin
@@ -87,7 +87,7 @@ _rfc3339_to_components :: proc(rfc_datetime: string) -> (res: dt.DateTime, utc_o
 
 	// Scan UTC offset
 	switch rfc_datetime[count] {
-	case 'Z':
+	case 'Z', 'z':
 		utc_offset = 0
 		count += 1
 	case '+', '-':
diff --git a/tests/core/time/test_core_time.odin b/tests/core/time/test_core_time.odin
index 7161cf349..1f936e4a7 100644
--- a/tests/core/time/test_core_time.odin
+++ b/tests/core/time/test_core_time.odin
@@ -94,6 +94,8 @@ rfc3339_tests :: []RFC3339_Test{
 	{"1985-04-12T23:20:50.52Z",      {482196050520000000},  true,  0,    23, false},
 	{"1985-04-12t23:20:50.52Z",      {482196050520000000},  true,  0,    23, false},
 	{"1985-04-12 23:20:50.52Z",      {482196050520000000},  true,  0,    23, false},
+	// Same, but lowercase z
+	{"1985-04-12 23:20:50.52z",      {482196050520000000},  true,  0,    23, false},
 
 	// This represents 39 minutes and 57 seconds after the 16th hour of December 19th, 1996 with an offset of -08:00 from UTC (Pacific Standard Time).
 	// Note that this is equivalent to 1996-12-20T00:39:57Z in UTC.