diff --git a/htdocs/langs/cy_GB/main.lang b/htdocs/langs/cy_GB/main.lang
index 05938a9992e..d6c76458644 100644
--- a/htdocs/langs/cy_GB/main.lang
+++ b/htdocs/langs/cy_GB/main.lang
@@ -10,10 +10,10 @@ SeparatorDecimal=.
 SeparatorThousand=,
 FormatDateShort=%d/%m/%Y
 FormatDateShortInput=%d/%m/%Y
-FormatDateShortJava=dd/MM/bbbb
-FormatDateShortJavaInput=dd/MM/bbbb
-FormatDateShortJQuery=dd/mm/bb
-FormatDateShortJQueryInput=dd/mm/bb
+FormatDateShortJava=dd/MM/yyyy
+FormatDateShortJavaInput=dd/MM/yyyy
+FormatDateShortJQuery=dd/mm/yy
+FormatDateShortJQueryInput=dd/mm/yy
 FormatHourShortJQuery=HH:MI
 FormatHourShort=%I:%M %p
 FormatHourShortDuration=% H: %M