如何将月份添加到NSDate对象?
NSDate *someDate = [NSDate Date] + 30Days.....;
Answers:
您需要使用NSDateComponents:
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
[dateComponents setMonth:1];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *newDate = [calendar dateByAddingComponents:dateComponents toDate:originalDate options:0];
[dateComponents release]; // If ARC is not used, release the date components
[date timeIntervalSinceDate:otherDate]
,它将以秒为单位返回它们之间的时差(过去的日期小于0,将来的日期大于0)。
在iOS 8和OS X 10.9中,您可以NSCalendarUnits
使用添加NSCalendar
:
目标C
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *someDate = [cal dateByAddingUnit:NSCalendarUnitMonth value:1 toDate:[NSDate date] options:0];
迅捷3
let date = Calendar.current.date(byAdding: .month, value: 1, to: Date())
迅捷2
let cal = NSCalendar.currentCalendar()
let date = cal.dateByAddingUnit(.Month, value: 1, toDate: NSDate(), options: [])
快速3.0
extension Date {
func addMonth(n: Int) -> Date {
let cal = NSCalendar.current
return cal.date(byAdding: .month, value: n, to: self)!
}
func addDay(n: Int) -> Date {
let cal = NSCalendar.current
return cal.date(byAdding: .day, value: n, to: self)!
}
func addSec(n: Int) -> Date {
let cal = NSCalendar.current
return cal.date(byAdding: .second, value: n, to: self)!
}
}
例如,要3
在Swift的当前日期中添加月份:
let date = NSCalendar.currentCalendar().dateByAddingUnit(.MonthCalendarUnit, value: 3, toDate: NSDate(), options: nil)!
let date = NSCalendar.currentCalendar().dateByAddingUnit(.Month, value: 3, toDate: NSDate(), options: [])
OptionSetType
结构NSCalendarUnit
使您可以更轻松地指定.Month
OptionSetType
(例如接受options:
参数NSCalendarOptions
)不能为nil
,因此传入空集([]
)表示“无选项”。.MonthCalendarUnit
已弃用,请使用.CalendarUnitMonth
对于SWIFT 3.0
这是函数,您可以将天,月,日减少任意数量,例如此处,我将当前系统日期的年份减少了100年,您可以将天,月也进行设置,还可以设置计数器,然后存储值在array中,并执行与该数组有关的任何操作
func currentTime(){
let date = Date()
let calendar = Calendar.current
var year = calendar.component(.year, from: date)
let month = calendar.component(.month, from: date)
let day = calendar.component(.day, from: date)
let pastyear = year - 100
var someInts = [Int]()
printLog(msg: "\(day):\(month):\(year)" )
for _ in pastyear...year {
year -= 1
print("\(year) ")
someInts.append(year)
}
print(someInts)
}
如果您想要的行为增加一个月并允许夏令时,则其他答案也可以正常工作。这样产生的结果是:
01/03/2017 00:00 + 1 month -> 31/03/2017 23:00
01/10/2017 00:00 + 1 month -> 01/11/2017 01:00
但是,我想忽略DST损失或增加的时间,例如:
01/03/2017 00:00 + 1 month -> 01/04/2017 00:00
01/10/2017 00:00 + 1 month -> 01/11/2017 00:00
因此,我检查是否通过了DST边界,如果是,则相应地增加或减少一个小时:
func offsetDaylightSavingsTime() -> Date {
// daylightSavingTimeOffset is either + 1hr or + 0hr. To offset DST for a given date, we need to add an hour or subtract an hour
// +1hr -> +1hr
// +0hr -> -1hr
// offset = (daylightSavingTimeOffset * 2) - 1 hour
let daylightSavingsTimeOffset = TimeZone.current.daylightSavingTimeOffset(for: self)
let oneHour = TimeInterval(3600)
let offset = (daylightSavingsTimeOffset * 2) - oneHour
return self.addingTimeInterval(offset)
}
func isBetweeen(date date1: Date, andDate date2: Date) -> Bool {
return date1.compare(self).rawValue * self.compare(date2).rawValue >= 0
}
func offsetDaylightSavingsTimeIfNecessary(nextDate: Date) -> Date {
if let nextDST = TimeZone.current.nextDaylightSavingTimeTransition(after: self) {
if nextDST.isBetweeen(date: self, andDate: nextDate){
let offsetDate = nextDate.offsetDaylightSavingsTime()
let difference = offsetDate.timeIntervalSince(nextDate)
return nextDate.addingTimeInterval(difference)
}
}
return nextDate
}
func dateByAddingMonths(_ months: Int) -> Date? {
if let dateWithMonthsAdded = Calendar.current.date(byAdding: .month, value: months, to: self) {
return self.offsetDaylightSavingsTimeIfNecessary(nextDate: dateWithMonthsAdded)
}
return self
}
测试:
func testDateByAddingMonths() {
let date1 = "2017-01-01T00:00:00Z".asDate()
let date2 = "2017-02-01T00:00:00Z".asDate()
let date3 = "2017-03-01T00:00:00Z".asDate()
let date4 = "2017-04-01T00:00:00Z".asDate()
let date5 = "2017-05-01T00:00:00Z".asDate()
let date6 = "2017-06-01T00:00:00Z".asDate()
let date7 = "2017-07-01T00:00:00Z".asDate()
let date8 = "2017-08-01T00:00:00Z".asDate()
let date9 = "2017-09-01T00:00:00Z".asDate()
let date10 = "2017-10-01T00:00:00Z".asDate()
let date11 = "2017-11-01T00:00:00Z".asDate()
let date12 = "2017-12-01T00:00:00Z".asDate()
let date13 = "2018-01-01T00:00:00Z".asDate()
let date14 = "2018-02-01T00:00:00Z".asDate()
var testDate = "2017-01-01T00:00:00Z".asDate()
XCTAssertEqual(testDate, date1)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date2)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date3)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date4)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date5)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date6)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date7)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date8)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date9)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date10)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date11)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date12)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date13)
testDate = testDate.dateByAddingMonths(1)!
XCTAssertEqual(testDate, date14)
}
为了完整起见,我使用的.asDate()方法
extension String {
static let dateFormatter = DateFormatter()
func checkIsValidDate() -> Bool {
return self.tryParseToDate() != nil
}
func tryParseToDate() -> Date? {
String.dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ"
return String.dateFormatter.date(from: self)
}
func asDate() -> Date {
return tryParseToDate()!
}
}
是否要根据用户选择的自动计算日期来添加“月”或恰好是30天,一天或一年?
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]
init];
[dateFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
NSDateComponents *components = [calendar components:(NSCalendarUnitHour | NSCalendarUnitMinute) fromDate:[NSDate date]];
NSDateComponents *dayComponent = [[NSDateComponents alloc]
init];
int changeid = [here number of days intValue];
dayComponent.hour = changeid;
NSCalendar *theCalendar = [NSCalendar currentCalendar];
NSDate *nextDate = [theCalendar
dateByAddingComponents:dayComponent toDate:[dateFormatter
dateFromString:self.fromDateTF.text] options:0];
NSLog(@"nextDate: %@ ...", nextDate);
[self.toDateTF setText:[dateFormatter
stringFromDate:nextDate]];
////月
您要添加“月”还是恰好30天?如果是30天,您可以这样操作:
// get a date
NSDate *date = [NSDate dateWithNaturalLanguageString:@"2011-01-02"];
// add 30 days to it (in seconds)
date = [date dateByAddingTimeInterval:(30 * 24 * 60 * 60)];
NSLog(@"%@", date); // 2011-02-01
注意:这不会考虑夏令时转换或leap秒。如果需要,请使用@TheEye的答案