This Plugin automatically change the post slug to Google Blogger Permalinks ready for switch wordpress to Google blogger.
This Plugin will generate Permalinks formatted for Google Blogger. If you want to move from WordPress to Google Blogger, using this plugin to generate the Google Blogger Permalinks, so you can switch your blog to blogspot without 404 error.
After install this plugin, when editing a post, give it a title and press Save and Continue Editing. The plugin will generate a permalinks formatted for Google Blogger. If you edit it, the plugin will honor your slug and won't change it.
Requirements - Important:
Settings > Permalinks has to be set to "Custom Structure" /%year%/%monthnum%/%postname%.html