- (BOOL)isEqualToDate:(NSDate *)otherDate;
与otherDate比较,相同返回YES
- (NSDate *)earlierDate:(NSDate *)anotherDate;
与anotherDate比较,返回较早的那个日期
- (NSDate *)laterDate:(NSDate *)anotherDate;
与anotherDate比较,返回较晚的那个日期
- (NSComparisonResult)compare:(NSDate *)other;
该方法用于排序时调用:
. 当实例保存的日期值与anotherDate相同时返回NSOrderedSame
. 当实例保存的日期值晚于anotherDate时返回NSOrderedDescending
. 当实例保存的日期值早于anotherDate时返回NSOrderedAscending // 获得本地时间指定时区 NSDate *dates = [NSDate date]; NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/beijing"]; [formatter setTimeZone:timeZone]; NSString *loctime = [formatter stringFromDate:dates];
(NSDate *) stringToDate:string { NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; NSDate *date = [dateFormatter dateFromString:string]; [dateFormatter release]; return date; }
-(NSInteger)daysWithinEraFromDate:(NSDate *) startDate toDate:(NSDate *) endDate { NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; unsigned int unitFlags = NSDayCalendarUnit; NSDateComponents *comps = [gregorian components:unitFlags fromDate:startDate toDate:endDate options:0]; int days = [comps day]; return days; }
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