nitinmauryalko

This plugin includes the option to display a current date and time in your sidebar using the built-in widget.

Clock_Widget

andy

This Plugin allows you to display time and date from all timezones. The setup page generates the shortcode you like. Just copy & paste this code on every place you want. The time is adjusted to the server time. 
Formats: 
 * Time (without seconds) 
 * Time 
 * Date (local format) 
 * Date 
 * Daten and Time

Saan World Clock

This Plugin display date and time of all timezones (Server time adjusted). Easy to use with shortcodes.

Clock_Widget vs Saan World Clock