wordpress plugin modification fix

I have a very simple plugin fix needed for wordpress. Take a look at my plugin code. Currently I have setting where I can set the time range I want the plugin to run ie. 1PM-4PM (the plugin runs randomly every x days between 1pm-4pm) Currently the plugin is for some reason running on the Last hour of the range I do ie. on one site i set it from 1PM-4PM (4pm = 7pm est = 19:00 hours) 10/24/12 19:00:45 wp_ POST id 303204857 PUBLISHED 10/25/12 19:00:42 wp_ POST id 303204841 PUBLISHED 10/26/12 19:01:03 wp_ POST id 303204803 PUBLISHED on another site i set from 12PM-6PM (7 pm = 10pm est = 22:00 hours) 11/16/12 22:15:43 wp_ POST id 740 PUBLISHED 11/19/12 22:09:14 wp_ POST id 687 PUBLISHED 11/22/12 22:11:55 wp_ POST id 758 PUBLISHED 11/25/12 22:09:40 wp_ POST id 651 PUBLISHED