Today — the present day and its uses in language, media, and computing

Language, grammar and etymology

In English the word appears in older spellings such as "to-day"; modern usage generally prefers the single form "today." Grammatically it answers the question "when?" and is part of a temporal series with words such as "yesterday," "tomorrow" and "now." Many languages have single words or short phrases serving the same role, and some mark the present day differently when distinguishing formal or literary registers.

Temporal boundaries and calendars

The notion of "today" is tied to civil timekeeping. Traditionally a day was reckoned by sunrise, sunset or the passage of a full rotation; modern civil practice usually defines the day as beginning at local midnight. Because calendars, time zones and daylight saving rules differ between places, the same clock time can belong to different calendar days in different regions.

Computing and calendaring

In software a "today" function typically returns the current date as reported by the system clock. Spreadsheet functions named TODAY or Today() and database expressions such as CURRENT_DATE are commonly used to perform date arithmetic, filtering and scheduling. Results depend on system time, locale settings and timezone handling, so behaviour can vary between machines or when services operate across borders.

Media, culture and idioms

The word "today" is widely used in journalism and broadcasting to signal immediacy and relevance; it appears in many programme and publication titles. In everyday speech it features in idioms and rhetorical appeals that emphasize urgency or contemporaneity, for example contrasting "today" with "yesterday" to mark change or progress.

Distinctions and usage notes

"Today" differs from "now": "now" typically denotes the immediate instant, while "today" covers the span of the civil day. In legal, administrative or technical contexts the meaning of "today" is sometimes explicitly defined to avoid ambiguity. In conversation, context and shared conventions usually make the intended meaning clear.

• As noun: "What happened today?"
• As adverb: "I will finish it today."
• In computing: used to compute ages, deadlines and report dates.

Because it is a basic temporal term, "today" is simple in form but central to how people organize time, plan actions and report events across linguistic, cultural and technical domains.