Arkadaşlar wp kullanıyorum.sitemap eklenti sayesinde sitemap olusturuorum
www.kelebekindir.net/siteharita.xml

ama google webmaster tools da şöyle bir hata var

Sitemap errors and warnings
Line Status Details
5175 Invalid date
An invalid date was found. Please fix the date or formatting before resubmitting. Parent tag:
Tag:
Value:
Found: url
lastmod
1969-12-31T23:59:59+00:00
Apr 6, 2008
5169 Invalid date
An invalid date was found. Please fix the date or formatting before resubmitting. Parent tag:
Tag:
Value:
Found: url
lastmod
1969-12-31T23:59:59+00:00
Apr 6, 2008
5163 Invalid date
An invalid date was found. Please fix the date or formatting before resubmitting. Parent tag:
Tag:
Value:
Found: url
lastmod
1969-12-31T23:59:59+00:00
Apr 6, 2008
5157 Invalid date
An invalid date was found. Please fix the date or formatting before resubmitting. Parent tag:
Tag:
Value:
Found: url
lastmod
1969-12-31T23:59:59+00:00
Apr 6, 2008

vs.vs.
bunu nasıl önleyebilirim.