检查日期是否介于两个日期之间

Question

我有这个代码将String转换为日期对象

let date2 = KeysData[indexPath.row]["starttime"] as? String

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"

if let date = dateFormatter.dateFromString(date2!) {
   println(date)          
}

我想知道如果当前日期落在2天我的阵列中得到之间startdate和endate

Answer 1

斯威夫特≧3

Swift 3让这更容易.

let fallsBetween = (startDate ... endDate).contains(Date())

现在,这NSDate是桥接到值类型Date并Date符合Comparable我们可以只是形成一个ClosedRange<Date>并使用该contains方法来查看当前日期是否包括在内.

警告:endDate必须大于或等于startDate.否则无法形成范围,代码会崩溃fatalError.

这很安全:

extension Date {
    func isBetween(_ date1: Date, and date2: Date) -> Bool {
        return (min(date1, date2) ... max(date1, date2)).contains(self)
    }
}

Answer 2

斯威夫特2

如需更好的答案,请参阅Swift≧3.

你已经在你的日期字符串转换的代码KeysData来NSDate.假设你有两个日期中startdate和enddate,所有你所要做的就是检查当前日期之间:

let startDate = ...
let endDate = ...

NSDate().isBetween(date: startDate, andDate: endDate)

extension NSDate {
    func isBetweeen(date date1: NSDate, andDate date2: NSDate) -> Bool {
        return date1.compare(self) == self.compare(date2)
    }
}

编辑:如果要执行包含范围检查,请使用以下条件:

 extension NSDate {
    func isBetween(date date1: NSDate, andDate date2: NSDate) -> Bool {
        return date1.compare(self).rawValue * self.compare(date2).rawValue >= 0
    }
}

Answer 3

对于Swift 4.2，我根据上述答案使用了此扩展名：

extension Date {
    func isBetween(_ date1: Date, and date2: Date) -> Bool {
        return (min(date1, date2) ... max(date1, date2)) ~= self
    }

不过要小心。如果此扩展名不包含您的开始日期（date1），请检查日期。可能是您需要缩短日期才能解决问题。例如，像这样：

let myDateWithoutTime = Calendar.current.startOfDay(for: myDate)

Answer 4

DateInterval有一个.contains函数（参见文档）：

extension Date {
    func isBetween(_ date1: Date, _ date2: Date) -> Bool {
        date1 < date2
            ? DateInterval(start: date1, end: date2).contains(self)
            : DateInterval(start: date2, end: date1).contains(self)
    }
}

然后你像这样使用它：

let date = Date()
let date1 = Date(timeIntervalSinceNow: 1000)
let date2 = Date(timeIntervalSinceNow: -1000)
date.isBetween(date1, date2) // true

请注意，如果您需要的话，这包括结束日期，或者添加 aguard来捕获它：

guard self != max(date1, date2) || self == min(date1, date2) else { return false }

经过一些重构后，您可能会得到如下结果：

extension Date {
    func isBetween(_ date1: Date, _ date2: Date) -> Bool {
        let minDate = min(date1, date2)
        let maxDate = max(date1, date2)

        guard self != minDate else { return true }
        guard self != maxDate else { return false }

        return DateInterval(start: minDate, end: maxDate).contains(self)
    }
}

那么这将通过以下测试用例：

XCTAssert(
    try XCTUnwrap(Date(fromString: "2020/01/15 09:30")).isBetween(
        try XCTUnwrap(Date(fromString: "2020/01/15 09:00")),
        try XCTUnwrap(Date(fromString: "2020/01/15 10:00"))
    )
)

XCTAssert(
    try XCTUnwrap(Date(fromString: "2020/01/16 01:00")).isBetween(
        try XCTUnwrap(Date(fromString: "2020/01/15 23:00")),
        try XCTUnwrap(Date(fromString: "2020/01/16 04:00"))
    )
)

XCTAssert(
    try XCTUnwrap(Date(fromString: "2020/01/15 10:00")).isBetween(
        try XCTUnwrap(Date(fromString: "2020/01/15 10:00")),
        try XCTUnwrap(Date(fromString: "2020/01/15 10:30"))
    )
)

XCTAssert(
    try XCTUnwrap(Date(fromString: "2020/01/15 10:00")).isBetween(
        try XCTUnwrap(Date(fromString: "2020/01/15 10:00")),
        try XCTUnwrap(Date(fromString: "2020/01/15 10:00"))
    )
)

XCTAssert(
    try XCTUnwrap(Date(fromString: "2020/01/15 09:00")).isBetween(
        try XCTUnwrap(Date(fromString: "2020/01/15 10:00")),
        try XCTUnwrap(Date(fromString: "2020/01/15 08:00"))
    )
)

XCTAssert(
    try XCTUnwrap(Date(fromString: "2020/01/15 08:00")).isBetween(
        try XCTUnwrap(Date(fromString: "2020/01/15 10:00")),
        try XCTUnwrap(Date(fromString: "2020/01/15 08:00"))
    )
)

XCTAssertFalse(
    try XCTUnwrap(Date(fromString: "2020/01/15 09:00")).isBetween(
        try XCTUnwrap(Date(fromString: "2020/01/15 10:00")),
        try XCTUnwrap(Date(fromString: "2020/01/15 13:00"))
    )
)

XCTAssertFalse(
    try XCTUnwrap(Date(fromString: "2020/01/15 10:30")).isBetween(
        try XCTUnwrap(Date(fromString: "2020/01/15 10:00")),
        try XCTUnwrap(Date(fromString: "2020/01/15 10:30"))
    )
)

XCTAssertFalse(
    try XCTUnwrap(Date(fromString: "2020/01/15 10:00")).isBetween(
        try XCTUnwrap(Date(fromString: "2020/01/15 10:00")),
        try XCTUnwrap(Date(fromString: "2020/01/15 08:00"))
    )
)

let date = Date()
let date1 = Date(timeIntervalSinceNow: 1000)
let date2 = Date(timeIntervalSinceNow: -1000)
XCTAssert(date.isBetween(date1, date2))