diff --git a/posix b/posix
new file mode 100644
index 0000000..a361978
--- /dev/null
+++ b/posix
@@ -0,0 +1,12 @@
+# %W%
+
+# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+Rule	POSIX	1970	1973	-	Apr	lastSun	2:00	1:00	D
+Rule	POSIX	1974	only	-	Jan	6	2:00	1:00	D
+Rule	POSIX	1975	only	-	Feb	23	2:00	1:00	D
+Rule	POSIX	1976	1986	-	Apr	lastSun	2:00	1:00	D
+Rule	POSIX	1987	max	-	Apr	Sun>=1	2:00	1:00	D
+Rule	POSIX	1970	max	-	Oct	lastSun	2:00	0	S
+
+# Zone	NAME		GMTOFF	RULES/SAVE	FORMAT	[UNTIL]
+Zone	_ST0_DT		0	POSIX		_%sT