In my job I need to schedule text messages precisely to the second. Accordingly I'm after an SMS app that can schedule texts down to the second - e.g 659.43, rather than 6.59 or 7.00.

Unfortunately, all the apps I've looked at only allow scheduling to the minute. 

Can anyone suggest, either 1, an app that  allows scheduling to the second,  or 2,  a simple way to achieve it by other means. 

Thanks.