Returns the Unix timestamp for the start of the current day (00:00:00).
Examples
Get the Unix timestamp for today's date
import { assertEquals } from "jsr:@std/assert";
import dayjs from "dayjs";
const todayTimestamp = today();
assertEquals(typeof todayTimestamp, 'number');
// Should match the start of today
assertEquals(todayTimestamp, dayjs().startOf('day').unix());