Some micro-optimizations
diff --git a/system/helpers/date_helper.php b/system/helpers/date_helper.php
index 0fa400d..7a0552b 100644
--- a/system/helpers/date_helper.php
+++ b/system/helpers/date_helper.php
@@ -677,8 +677,8 @@
$is_unix = ! ( ! $is_unix OR $is_unix === 'days');
// Validate input and try strtotime() on invalid timestamps/intervals, just in case
- if ( ( ! preg_match('/^[0-9]+$/', $unix_start) && ($unix_start = @strtotime($unix_time)) === FALSE)
- OR ( ! preg_match('/^[0-9]+$/', $mixed) && ($is_unix === FALSE OR ($mixed = @strtotime($mixed)) === FALSE))
+ if ( ( ! ctype_digit((string) $unix_start) && ($unix_start = @strtotime($unix_time)) === FALSE)
+ OR ( ! ctype_digit((string) $mixed) && ($is_unix === FALSE OR ($mixed = @strtotime($mixed)) === FALSE))
OR ($is_unix === TRUE && $mixed < $unix_start))
{
return FALSE;