介绍三种方法获取 Date (NSDate) 的年月日。
用 date 表示当前日期。测试日期为公历 2017 年 2 月 5 日，农历丁酉年，鸡年，正月初九。
let date: Date = Date() NSDate *date = [NSDate date];
获取公历年月日
用 Calendar (NSCalendar) 获取公历年月日
let calendar: Calendar = Calendar(identifier: .gregorian)
print("Year:", calendar.component(.year, from: date))
print("Month:", calendar.component(.month, from: date))
print("Day:", calendar.component(.day, from: date))
NSCalendar *calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]; NSLog(@"Year: %ld", [calendar component:NSCalendarUnitYear fromDate:date]); NSLog(@"Month: %ld", [calendar component:NSCalendarUnitMonth fromDate:date]); NSLog(@"Day: %ld", [calendar component:NSCalendarUnitDay fromDate:date]);
结果
用 Calendar 和 DateComponents (NSCalendar 和 NSDateComponents) 获取公历年月日
let componentSet: Set<Calendar.Component> = Set(arrayLiteral: .year, .month, .day)
let components: DateComponents = calendar.dateComponents(componentSet, from: date)
print("Year:", components.year!)
print("Month:", components.month!)
print("Day:", components.day!)
NSCalendarUnit calenderUnit = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay; NSDateComponents *components = [calendar components:calenderUnit fromDate:date]; NSLog(@"Year: %ld", components.year); NSLog(@"Month: %ld", components.month); NSLog(@"Day: %ld", components.day);
结果
用 DateFormatter (NSDateFormatter) 获取公历年月日
let formatter: DateFormatter = DateFormatter()
print("Date formatter identifier:", formatter.calendar.identifier) // gregorian by default
formatter.dateFormat = "y"
print("Year:", formatter.string(from: date))
formatter.dateFormat = "M"
print("Month:", formatter.string(from: date))
formatter.dateFormat = "d"
print("Day:", formatter.string(from: date))
NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; NSLog(@"Date formatter calendar: %@", formatter.calendar.calendarIdentifier); // gregorian by default formatter.dateFormat = @"y"; NSLog(@"Year: %@", [formatter stringFromDate:date]); formatter.dateFormat = @"M"; NSLog(@"Month: %@", [formatter stringFromDate:date]); formatter.dateFormat = @"d"; NSLog(@"Day: %@", [formatter stringFromDate:date]);
获取农历年月日
用 Calendar (NSCalendar) 获取农历年月日
与公历相似，更改 Calendar (NSCalendar) 的初始化即可，其他代码相同
let calendar: Calendar = Calendar(identifier: .chinese)
NSCalendar *calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierChinese];
结果
用 Calendar 和 DateComponents (NSCalendar 和 NSDateComponents) 获取农历年月日
同上节用 Calendar (NSCalendar) 获取农历年月日
用 DateFormatter (NSDateFormatter) 获取农历年月日
与公历相似，在初始化 DateFormatter (NSDateFormatter) 之后，给 calendar 属性赋值即可，其他代码相同
let formatter: DateFormatter = DateFormatter() formatter.calendar = Calendar(identifier: .chinese)
NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; formatter.calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierChinese];
结果
计算日期年份的生肖
自定义一个类 ChineseCalendar 来计算。十二生肖数组写在类外面。
十二生肖数组
ChineseCalendar 的类方法
static func zodiac(withYear year: Int) -> String {
let zodiacIndex: Int = (year - 1) % Zodiacs.count
return Zodiacs[zodiacIndex]
}
static func zodiac(withDate date: Date) -> String {
let calendar: Calendar = Calendar(identifier: .chinese)
return zodiac(withYear: calendar.component(.year, from: date))
}
测试
print("Chinese zodiac string:", ChineseCalendar.zodiac(withDate: date))
结果
计算日期年份的天干地支
在 ChineseCalendar 中用类方法计算。天干地支数组写在类外面。
天干地支数组
private let HeavenlyStems: [String] = ["甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸"] private let EarthlyBranches: [String] = ["子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥"]
ChineseCalendar 的类方法
static func era(withYear year: Int) -> String {
let heavenlyStemIndex: Int = (year - 1) % HeavenlyStems.count
let heavenlyStem: String = HeavenlyStems[heavenlyStemIndex]
let earthlyBrancheIndex: Int = (year - 1) % EarthlyBranches.count
let earthlyBranche: String = EarthlyBranches[earthlyBrancheIndex]
return heavenlyStem + earthlyBranche
}
static func era(withDate date: Date) -> String {
let calendar: Calendar = Calendar(identifier: .chinese)
return era(withYear: calendar.component(.year, from: date))
}
测试
print("Chinese era string:", ChineseCalendar.era(withDate: date))
结果
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