dpoakaspine

Shows the date & time of the last scheduled post in the publish box. Also comes with a shortcode [next-scheduled-post] to show the next schedlued post in your theme.

last scheduled post time

Shows the date & time of the last scheduled post in the publish box + shortcode [next-scheduled-post] for your theme.

adridi

A calendar that improves the user experience on your website. 
You can change the style and language of your calendar widget in the WordPress settings (“Design” -> “Widgets”). 
The calendar is responsive which makes it suitable for all type of devices.

Responsive Calendar Widget

A responsive and simple calendar for your Wordpress website. It is interactive and you can change the style in your Wordpress settings.

last scheduled post time vs Responsive Calendar Widget