diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index f83264b..0a4e94e 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -280,6 +280,10 @@
 
   call assert_equal(1484653763, strptime('%Y-%m-%d %T', '2017-01-17 11:49:23'))
 
+  " Force DST and check that it's considered
+  let $TZ = 'WINTER0SUMMER,J1,J365'
+  call assert_equal(1484653763 - 3600, strptime('%Y-%m-%d %T', '2017-01-17 11:49:23'))
+
   call assert_fails('call strptime()', 'E119:')
   call assert_fails('call strptime("xxx")', 'E119:')
   call assert_equal(0, strptime("%Y", ''))