Function now 

pub fn now<'a, V>() -> SQLExpr<'a, V, <V::DialectMarker as DialectTypes>::TimestampTz, NonNull, Scalar>
where
    V: SQLParam + 'a,
    V::DialectMarker: PostgresDateTimeSupport,

NOW - returns the current timestamp with time zone (PostgreSQL).

Example

use drizzle_core::expr::now;

// SELECT NOW()
let current = now::<PostgresValue>();