The term 'date-arithmetic' refers to determining via code such information as how many days, hours, etc. between two calendar dates, and determining the last day of the month, or whether a date is a weekday or a weekend.
In the Hypertext Transfer Protocol (HTTP), HTTP header fields contain the operating parameters of an HTTP request or response. With the request or response line (first line of message), they form the message header.
A hyperlink is a reference to a document (or a section) that can be followed for retrieval using a navigation system that allows selecting emphasized content within an originating document.
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