如何快速获取今天和明天的日期4

我会用组件来做到这一点。

假设您需要按秒定义的时间time(2)。如果您需要以定义的毫秒数time(3)，则可以将其乘以1000。

// Get right now as it's `DateComponents`.
let now = Calendar.current.dateComponents(in: .current, from: Date())

// Create the start of the day in `DateComponents` by leaving off the time.
let today = DateComponents(year: now.year, month: now.month, day: now.day)
let dateToday = Calendar.current.date(from: today)!
print(dateToday.timeIntervalSince1970)

// Add 1 to the day to get tomorrow.
// Don't worry about month and year wraps, the API handles that.
let tomorrow = DateComponents(year: now.year, month: now.month, day: now.day! + 1)
let dateTomorrow = Calendar.current.date(from: tomorrow)!
print(dateTomorrow.timeIntervalSince1970)

您可以减去1得到昨天。

如果您需要在世界通用时间（UTC，GMT，Z…您给世界通用名称指定的任何名称），请使用以下命令。

let utc = TimeZone(abbreviation: "UTC")!
let now = Calendar.current.dateComponents(in: utc, from: Date())