diff --git a/reference/datetime/functions/mktime.xml b/reference/datetime/functions/mktime.xml
index c5e0de1402..4f57848346 100644
--- a/reference/datetime/functions/mktime.xml
+++ b/reference/datetime/functions/mktime.xml
@@ -150,8 +150,7 @@
mktime returns the Unix timestamp of the arguments
given.
- If the arguments are invalid, the function returns &false; (before PHP 5.1
- it returned -1).
+ If the arguments are invalid, the function returns &false;.
diff --git a/reference/datetime/functions/strtotime.xml b/reference/datetime/functions/strtotime.xml
index 582eecd887..2ada08e448 100644
--- a/reference/datetime/functions/strtotime.xml
+++ b/reference/datetime/functions/strtotime.xml
@@ -62,8 +62,7 @@
&reftitle.returnvalues;
- Returns a timestamp on success, &false; otherwise. Previous to PHP 5.1.0,
- this function would return -1 on failure.
+ Returns a timestamp on success, &false; otherwise.