If the time of evaluation were absorbed into logical form via quantifiers, context-sensitive temporal expressions like 'now' and 'then' would lose their semantic anchoring to the context of utterance.

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Semantic anchoring(as used in philosophy of language and ethics): The idea that words and moral concepts get their meaning by being connected to something concrete or real in the world—like how 'water' is anchored to the actual liquid H2O.
context of utterance(The temporal operator 'one hundred years ago' is said to shift this context for expressions in its scope): The contextual parameters (including time) relative to which the reference of context-sensitive expressions is determined
context-sensitive(Used to describe terms like 'I' and 'left' whose reference shifts with the context of use.): A term whose semantic value or referent varies depending on features of the context of utterance, such as the identity or orientation of the speaker.
logical form(Used to characterize logical consequence): The way that a sentence is built up from the logical particles.

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