Dynamic data within the Logic Template is data, which unlike literals, must be determined at run time. Three types of dynamic data exist: dynamic values, dynamic text strings, and dynamic date-time values.

A dynamic date-time value may be an HTML variable, a field date-time value, a relative date value, a relative time value, a relative date-time value, a simple date-time expression, or a complex date-time expression.

An HTML variable is a name to which a value has been assigned, either as part of a name-value pair within the query URL, or as the result of an assignment statement within the logic template.

Dynamic Date-Time Values
A dynamic date-time value can be used within any numerical expression where a date-time variable can be used. If a dynamic date-time value is to be displayed, it must be done using a Format command. Displaying it directly would result in it being displayed as a meaningless unsign integer value.

Simple Expressions
A simple date-time expression can be either a combination of one or more time duration values connected by plus or minus signs; or a combination of one or more time duration values plus a relative date value or a relative time value or a relative date-time value, connected by plus or minus signs. A simple date-time expression is enclosed within quotation marks. No individual components of the expresion are independently enclosed within quotation marks.

Evaluation of the expression proceeds from left to right. There is no precedence given to any operator over any other.

Complex Expression
A complex date-time expression is any combination of simple date-time expressions date, time, or date-time constants; date-time extractions; relative date, time or date-time values; and time duration values, and reasonable numeric functions; grouped by one or more pairs of parenthesis.

Evaluation of the expression proceeds from the inner-most level of parenthesis outward, and then from left to right within each level. There is no precedence given to any operator over any other.

An HTML variable is a name to which a value has been assigned, either as part of a name-value pair within the query URL, or as the result of an assignment statement within the Logic Template.

A field date-time value is a value extracted from a date-time data field within the record currently being processed. It is expressed simply as the name of the date-time data field defined within the Load Definition file.

`PUB_DATE` publication date for an article

Relative Date Values
A relative date value is any one of a number of supported strings enclosed within a pair of quotation marks. The result returned is relative to the current system date.

Relative Time Values
A relative time value is any one of a number of supported strings enclosed within a pair of quotation marks. The result returned is relative to the current system time.

Relative Date-Time Value
A relative date-time value is any one of a number of supported strings enclosed within a pair of quotation marks. The result returned is relative to the current system date and time.