时间相关类和主要方法NSDateFormatter,NSDate
总的说来
时间与字符串相关的,可以使用NSDateFormatter
时间与 年丶月丶日丶时丶分丶秒丶周相关的,可以使用NSCalendar和NSDateComponents
时间与地区相关的,可以使用NSTimeZone
1,NSDateFormatter
日期转字符串
- (NSString *)stringFromDate:(NSDate *)date;
字符串转日期
- (nullable NSDate *)dateFromString:(NSString *)string;
2,NSdate
获取格林威治时间
+ (instancetype)date;
获取本地的localDate方法:
NSTimeZone * zone = [NSTimeZone systemTimeZone];
NSDate * localDate = [[NSDate date]dateByAddingTimeInterval:zone.secondsFromGMT];
3,NSCalendar
主要属性
NSCalendar *currentCalendar;
NSCalendarIdentifier calendarIdentifier;
NSLocale *locale;NSTimeZone *timeZone; ***NSTimeZone***
NSUInteger firstWeekday;
NSUInteger minimumDaysInFirstWeek;
NSDateComponents转NSDate
- (nullable NSDate *)dateFromComponents:(NSDateComponents *)comps;
- (nullable NSDate *)dateByAddingComponents:(NSDateComponents *)comps toDate:(NSDate *)date options:(NSCalendarOptions)opts;
- (nullable NSDate *)dateByAddingUnit:(NSCalendarUnit)unit value:(NSInteger)value toDate:(NSDate *)date options:(NSCalendarOptions)options
- (nullable NSDate *)dateBySettingUnit:(NSCalendarUnit)unit value:(NSInteger)v ofDate:(NSDate *)date options:(NSCalendarOptions)opts
- (nullable NSDate *)dateBySettingHour:(NSInteger)h minute:(NSInteger)m second:(NSInteger)s ofDate:(NSDate *)date options:(NSCalendarOptions)opts
NSDate转NSDateComponents
- (NSDateComponents *)components:(NSCalendarUnit)unitFlags fromDate:(NSDate *)date;
- (NSDateComponents *)components:(NSCalendarUnit)unitFlags fromDate:(NSDate *)startingDate toDate:(NSDate *)resultDate options:(NSCalendarOptions)opts;
- (NSInteger)component:(NSCalendarUnit)unit fromDate:(NSDate *)date NS_AVAILABLE;
- (NSDateComponents *)componentsInTimeZone:(NSTimeZone *)timezone fromDate:(NSDate *)date
4,NSDateComponents
NSCalendar *calendar ***NSCalendar***
NSTimeZone *timeZone ***NSTimeZone***
NSInteger era;
NSInteger year;
NSInteger month;
NSInteger day;
NSInteger hour;
NSInteger minute;
NSInteger second;
NSInteger nanosecondNSInteger weekday;
NSInteger weekdayOrdinal;
NSInteger quarter
NSInteger weekOfMonth
NSInteger weekOfYear
NSInteger yearForWeekOfYear
(getter=isLeapMonth) BOOL leapMonth
(nullable, readonly, copy) NSDate *date ***NSDate***
- (void)setValue:(NSInteger)value forComponent:(NSCalendarUnit)unit NS_AVAILABLE(10_9, 8_0);
- (NSInteger)valueForComponent:(NSCalendarUnit)unit NS_AVAILABLE(10_9, 8_0);
5,NSTimeZone
NSString *name;NSData *data;
NSTimeZone *systemTimeZone;
NSTimeZone *defaultTimeZone;
NSTimeZone *localTimeZone;
NSArray*knownTimeZoneNames;
NSDictionary*abbreviationDictionary
NSInteger secondsFromGMT;
NSString *abbreviation;
- (NSInteger)secondsFromGMTForDate:(NSDate *)aDate;
- (nullable NSString *)abbreviationForDate:(NSDate *)aDate;
+ (nullable instancetype)timeZoneWithName:(NSString *)tzName;
+ (nullable instancetype)timeZoneWithName:(NSString *)tzName data:(nullable NSData *)aData;
- (nullable instancetype)initWithName:(NSString *)tzName;
- (nullable instancetype)initWithName:(NSString *)tzName data:(nullable NSData *)aData;
+ (instancetype)timeZoneForSecondsFromGMT:(NSInteger)seconds;
+ (nullable instancetype)timeZoneWithAbbreviation:(NSString *)abbreviation;
