JQuery :: Validate For Each - PHP / MySQL Data Records

I have a database listing of properties down the page. Each property row has a date selector and a time selector. I need to somehow validate that if one of the dates is selected the time must be selected per property record before the bulk save can happen (or visa versa), if neither are selected it cane be left blank and addressed later. How I can go about validating this using jquery?

The field names are as follows:
DATE - data[Property][777][entry_date]
TIME - data[Property][777][entry_time]
NOTE: 777 is the property ID and changes per record down the screen.

I basically need something such as within a function to run dynamically:
if(data[Property][$id][entry_date] <> NULL) {
data[Property][$id][entry_time] is required
} else if (data[Property][$id][entry_time ] <> NULL) {
data[Property][$id][entry_date ] is required
}