var obj=db.noCheckOnWork.find({"time":{$regex:/[^x00-xff][^/();@!$&*%#~]$/i}});
while(obj.hasNext())
{
var doc=obj.next();
var new_data="2017-11-20 18:41:57 Mon";
db.noCheckOnWork.update({_id:doc._id},{$set:{"time":new_data}},false,true)
}
while(obj.hasNext())
{
var doc=obj.next();
var new_data="2017-11-20 18:41:57 Mon";
db.noCheckOnWork.update({_id:doc._id},{$set:{"time":new_data}},false,true)
}