The keyword phrase "11 sep to 90 days" does not belong to a single part of speech but functions as a cohesive unit. Grammatically, it is a modifier phrase, specifically a temporal phrase, that defines a precise period. Its role within a sentence is typically either adjectival (describing a noun) or adverbial (modifying a verb, adjective, or adverb). As the main point of an article, its function is to establish a specific, bounded timeframe as the subject of analysis.
The phrase is composed of two noun phrases ("11 sep" and "90 days") linked by the preposition "to." The first noun phrase, "11 sep," establishes a fixed starting point or anchor date. The second, "90 days," denotes a duration. The preposition "to" indicates the extent of this duration from the starting point, thereby creating a defined interval. When used adjectivally, it qualifies a noun, as in "the 11 sep to 90 days recovery period." When used adverbially, it specifies the timeframe of an action, as in "data was collected from 11 sep for 90 days."
For the purpose of an article, identifying this phrase as a temporal modifier is the crucial step. Its practical application is to act as a specifier that sets the scope and boundaries of the topic. The main point is not the grammatical classification itself, but the concept it represents: a specific, non-negotiable window of time. The article's content would therefore focus exclusively on the events, data, or implications that exist within this precisely defined period, beginning on September 11th and extending for the subsequent 90 days.
