diff --git a/code/modules/holiday/holidays.dm b/code/modules/holiday/holidays.dm
index f41f607dabe1..30e967460529 100644
--- a/code/modules/holiday/holidays.dm
+++ b/code/modules/holiday/holidays.dm
@@ -701,7 +701,7 @@
 
 /datum/holiday/xmas
 	name = CHRISTMAS
-	begin_day = 23
+	begin_day = 22
 	begin_month = DECEMBER
 	end_day = 27
 	holiday_hat = /obj/item/clothing/head/costume/santa