diff --git a/dlls/ntdll/time.c b/dlls/ntdll/time.c
index 30c71db2c7a..1159a89bcbd 100644
--- a/dlls/ntdll/time.c
+++ b/dlls/ntdll/time.c
@@ -233,6 +233,9 @@ static const struct tagTZ_INFO TZ_INFO[] =
    {"IST",
     {'I','s','r','a','e','l',' ','S','t','a','n','d','a','r','d',' ','T','i',
      'm','e','\0'}, -120, 0},
+   {"IDT",
+    {'I','s','r','a','e','l',' ','S','t','a','n','d','a','r','d',' ','T','i',
+     'm','e','\0'}, -180, 1},
    {"MSK",
     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
      'i','m','e','\0'}, -180, 0},