Count down only works for future dates

Hi

Count down seems not be working if I set todays date and for example 180 minutes. I have also tested to just have 180 minutes without setting any dates.

Count down works fine when I set a future date but I want the possibilty to set todays date and just count hours, minutes and seconds from the time I have change the the true value on activation. Is this possible to achive?

Per

http://wordpress.org/extend/plugins/wp-maintenance-mode/