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-rw-r--r--src/Monolog/Handler/RotatingFileHandler.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/Monolog/Handler/RotatingFileHandler.php b/src/Monolog/Handler/RotatingFileHandler.php
index 62feb22..39e4393 100644
--- a/src/Monolog/Handler/RotatingFileHandler.php
+++ b/src/Monolog/Handler/RotatingFileHandler.php
@@ -69,7 +69,7 @@ class RotatingFileHandler extends StreamHandler
public function setFilenameFormat($filenameFormat, $dateFormat)
{
- if (!preg_match('{^Y(([/_.-]m)([/_.-]d)?)?$}', $dateFormat)) {
+ if (!preg_match('{^Y(([/_.-]?m)([/_.-]?d)?)?$}', $dateFormat)) {
throw new InvalidArgumentException(
'Invalid date format - format must be one of '.
'RotatingFileHandler::FILE_PER_DAY ("Y-m-d"), RotatingFileHandler::FILE_PER_MONTH ("Y-m")'.