diff --git a/cards.tal b/cards.tal
index a0e34bd..2ad5bd3 100644
--- a/cards.tal
+++ b/cards.tal
@@ -139,7 +139,7 @@
     #00 .DateTime/hr DEI #0e10 MUL2 ADD2
     #00 .DateTime/min DEI #003c MUL2 ADD2
     #00 .DateTime/sec DEI ADD2 ( s* )
-    DUP2 .DateTime/doy DEI2 MUL2 ( s* sdoy* )
+    DUP2 .DateTime/doy DEI2 EOR2 ( s* sdoy* )
     #0001 ROT2 OVR2             ( y* 1* x* 1* )
     ORA2 ;rng-x STA2            ( y* 1* )
     ORA2 ;rng-x STA2 JMP2r      ( )