If its an actual date e.g. Tuesday, December 15th 2010 1:00pm CST, then you can use a data attribute.
However, if it's just a generic time of day e.g. any given Wednesday at 1:00pm, the you will need to create attributes to hold the day, the time and meridian as strings and or numbers.
I would recommend creating a entity in the model just for this information and then setting a relationship to it.
Pseudocode:
DayAndTimeEntity{
weekdayName = sting;
timeOfDay = string or number; //use a number if you need to do calculations
isAM = BOOL;
}
in use, "any Monday at 1:00pm" would look like:
aDayAndTimeEntityInstance{
weekdayName = "Monday";
timeOfDay = "1:00"
isAM = NO;
}
Then set a relationship to any other entities that need to store this time. You can elaborate on the basic idea as needed.