diff --git a/src/IO/parseDateTimeBestEffort.cpp b/src/IO/parseDateTimeBestEffort.cpp
index 2924ad88506..68565782edf 100644
--- a/src/IO/parseDateTimeBestEffort.cpp
+++ b/src/IO/parseDateTimeBestEffort.cpp
@@ -371,7 +371,10 @@ ReturnType parseDateTimeBestEffortImpl(
         {
             char c = *in.position();
 
-            if (c == ' ' || c == 'T')
+            /// 'T' is a separator between date and time according to ISO 8601.
+            /// But don't skip it if we didn't read the date part yet, because 'T' is also a prefix or 'Tue' and 'Thu'.
+
+            if (c == ' ' || (c == 'T' && year && !has_time))
             {
                 ++in.position();
             }
diff --git a/tests/queries/0_stateless/01123_parse_date_time_best_effort_even_more.reference b/tests/queries/0_stateless/01123_parse_date_time_best_effort_even_more.reference
new file mode 100644
index 00000000000..558ba34abcd
--- /dev/null
+++ b/tests/queries/0_stateless/01123_parse_date_time_best_effort_even_more.reference
@@ -0,0 +1,2 @@
+2018-08-18 07:22:16
+2018-08-16 07:22:16
diff --git a/tests/queries/0_stateless/01123_parse_date_time_best_effort_even_more.sql b/tests/queries/0_stateless/01123_parse_date_time_best_effort_even_more.sql
new file mode 100644
index 00000000000..a4f6f173402
--- /dev/null
+++ b/tests/queries/0_stateless/01123_parse_date_time_best_effort_even_more.sql
@@ -0,0 +1,2 @@
+SELECT toTimeZone(parseDateTimeBestEffort('Thu, 18 Aug 2018 07:22:16 GMT'), 'UTC');
+SELECT toTimeZone(parseDateTimeBestEffort('Tue, 16 Aug 2018 07:22:16 GMT'), 'UTC');