Errors in debug mode on dashboard

Would you please be so kind to finally fix these errors on the dashboard:

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Warning: date() expects parameter 2 to be long, string given in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-admin/includes/dashboard.php on line 609 Warning: date() expects parameter 2 to be long, string given in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-admin/includes/dashboard.php on line 611 Warning: date() expects parameter 2 to be long, string given in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-includes/functions.php on line 105 Notice: Undefined index: 00 in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-includes/locale.php on line 266 Notice: Undefined index: in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-includes/locale.php on line 282 Warning: date() expects parameter 2 to be long, string given in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-includes/functions.php on line 107 Warning: date() expects parameter 2 to be long, string given in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-includes/functions.php on line 109 Notice: Undefined offset: 0 in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-includes/locale.php on line 297 Warning: date() expects parameter 2 to be long, string given in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-includes/functions.php on line 110 Notice: Undefined offset: 0 in /mnt/webc/d3/15/51893315/htdocs/opajaap/test/wordpress/wp-includes/locale.php on line 297

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