iOS NSDate时间换算

来源:互联网 发布:左归丸与知柏地黄丸 编辑:程序博客网 时间:2024/04/29 02:54

iOS开发过程中,经常会用到时间,比如今天相对于过去某一天相差多少天,多少小时,多少分钟等等,还要换算,啊啊啊啊啊,什么加减乘除,什么12,什么60,什么24,统统滚蛋吧,今天为了时间,我也是拼了,下面我把经常用的时间一一列举出来了,希望能够对读者有所帮助;

在一个ViewController里面开始吧,gogogogoogogogo;

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];                // 1、获取当前时间    NSDate *now = [NSDate date];    NSDateFormatter *nowFormate = [[NSDateFormatter alloc] init];    nowFormate.dateFormat = @"yyyy-MM-dd HH:mm:ss";    NSString *nowTime = [nowFormate stringFromDate:now];    NSLog(@"nowTime = %@",nowTime);        // 2、拿现在的时间和过去时间或者将来时间对比,计算出相差多少天,多少年,多少秒等等;    NSDate *beforTime = [nowFormate dateFromString:@"2014-06-14 19:25:00"];    NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];        //世纪    NSInteger era  = kCFCalendarUnitEra;        //年    NSInteger year = kCFCalendarUnitYear;        //月    NSInteger month = kCFCalendarUnitMonth;        //小时    NSInteger hour = kCFCalendarUnitHour;        //分钟    NSInteger minute = kCFCalendarUnitMinute;        //秒    NSInteger second = kCFCalendarUnitSecond;        NSDateComponents *compsEra = [calender components:era fromDate:beforTime toDate:now options:0];    NSDateComponents *compsYear = [calender components:year fromDate:beforTime toDate:now options:0];    NSDateComponents *compsMonth = [calender components:month fromDate:beforTime toDate:now options:0];    NSDateComponents *compsHour = [calender components:hour fromDate:beforTime toDate:now options:0];    NSDateComponents *compsMinute = [calender components:minute fromDate:beforTime toDate:now options:0];    NSDateComponents *compsSecond = [calender components:second fromDate:beforTime toDate:now options:0];        NSLog(@"相差世纪个数 = %ld",[compsEra era]);    NSLog(@"相差年个数 = %ld",[compsYear year]);    NSLog(@"相差月个数 = %ld",[compsMonth month]);    NSLog(@"相差小时个数 = %ld",[compsHour hour]);    NSLog(@"相差分钟个数 = %ld",[compsMinute minute]);    NSLog(@"相差秒个数 = %ld",[compsSecond second]);        // 3、获取时间戳(相对于1970年)    CGFloat timestamp = now.timeIntervalSince1970;    NSLog(@"距离1970年有多少秒 = %f",timestamp);        // 4、计算距离现在有多少秒    CGFloat sinceNow = beforTime.timeIntervalSinceNow;    NSLog(@"距离现在有多少秒 = %f",fabs(sinceNow));        }@end

输出结果:

2016-06-14 16:46:12.651 Timer[2811:639641] nowTime = 2016-06-14 16:46:12

2016-06-14 16:46:12.654 Timer[2811:639641]相差世纪个数 = 0

2016-06-14 16:46:12.654 Timer[2811:639641]相差年个数 = 1

2016-06-14 16:46:12.654 Timer[2811:639641]相差月个数 = 23

2016-06-14 16:46:12.654 Timer[2811:639641]相差小时个数 = 17541

2016-06-14 16:46:12.654 Timer[2811:639641]相差分钟个数 = 1052481

2016-06-14 16:46:12.654 Timer[2811:639641]相差秒个数 = 63148872

2016-06-14 16:46:12.654 Timer[2811:639641]距离1970年有多少秒 = 1465893972.649262

2016-06-14 16:46:12.654 Timer[2811:639641]距离现在有多少秒 = 63148872.654635


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