fix "date" attribute default value
fix "date" attribute default value

wangjordy/wangjordy.github.io,DevinLow/DevinLow.github.io,amobiz/hexo,noikiy/hexo,zhipengyan/hexo,magicdawn/hexo,zhipengyan/hexo,wangjordy/wangjordy.github.io,aulphar/hexo,hexojs/hexo,kywk/hexi,iamprasad88/hexo,hexojs/hexo,DevinLow/DevinLow.github.io,kywk/hexi,ppker/hexo,leelynd/tapohuck,ppker/hexo