[英]Swift - Check if date is in next week / month. ( isDateInNextWeek() isDateInNextMonth() )
[英]Generating the start and end of the month. Swift 2
我有以下代碼:
func rangeOfPeriod(period: NSCalendarUnit, date: NSDate) -> (NSDate, NSDate) {
let calendar = NSCalendar.currentCalendar()
var startDate: NSDate? = nil
var duration: NSTimeInterval = 0
calendar.rangeOfUnit(period, startDate: &startDate, interval: &duration, forDate: date)
let endDate = startDate!.dateByAddingTimeInterval(duration - 1)
return (startDate!, endDate)
}
當我打印以下幾行時:
print("Day test = \(rangeOfPeriod(.Day, date: NSDate()))")
print("Week test = \(rangeOfPeriod(.WeekOfYear, date: NSDate()))")
print("month test = \(rangeOfPeriod(.Month, date: NSDate()))")
print("Year test = \(rangeOfPeriod(.Year, date: NSDate()))")
除了一個月之外,所有這些都按預期工作。
結果我得到“month test = (2016-03-01 00:00:00 +0000, 2016-03-31 22:59:59 +0000)”,結果似乎少了一個小時。 對於所有其他人,我得到“2016-03-26 23:59:59 +0000”。
任何幫助,將不勝感激
可能對rangeOfUnit
方法中的interval
參數存在混淆。
從文檔
func rangeOfUnit(_ unit: NSCalendarUnit, startDate datep: AutoreleasingUnsafeMutablePointer<NSDate?>, interval tip: UnsafeMutablePointer<NSTimeInterval>, forDate date: NSDate) -> Bool
.....
提示:返回時,包含的持續時間(如
NSTimeInterval
日歷部的)unit
包含日期date
本月(2016 年 3 月)由於夏令時更改,持續時間為
31 * 86400.0 - 3600.0 = 2674800.0
這意味着缺少一個小時,但沒有指定時間。
為了得到月底,這是更准確的
func endOfThisMonth() -> NSDate
{
let calendar = NSCalendar.currentCalendar()
let components = NSDateComponents()
components.day = 1
let startOfNextMonth = calendar.nextDateAfterDate(NSDate(), matchingComponents: components, options: .MatchNextTime)!
return calendar.dateByAddingUnit(.Second, value: -1, toDate: startOfNextMonth, options: [])!
}
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