get the start and end of today as an iso string in swift

main.swift
let now = Date() // get the current date and time
let calendar = Calendar(identifier: .gregorian) // use the Gregorian calendar
let startOfDay = calendar.startOfDay(for: now) // get the start of today
let endOfDay = calendar.date(byAdding: .day, value: 1, to: startOfDay)! // get the start of tomorrow and subtract a second to get the end of today

let formatter = ISO8601DateFormatter() // create an ISO8601 formatter
formatter.timeZone = TimeZone.current // set the formatter's timezone
let startOfDayISO = formatter.string(from: startOfDay) // format the start of today as an ISO string
let endOfDayISO = formatter.string(from: endOfDay.addingTimeInterval(-1)) // format the end of today as an ISO string
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