iOS获得时间

//
//  LXPTIME.m
//  gcd
//
//  Created by chuangqu on 16/4/22.
//  Copyright © 2016年 mr.liu. All rights reserved.
//

#import "LXPTIME.h"

@implementation LXPTIME

- (void)getTime{
    //获取系统当前的时间
    NSDate  *datatime=[NSDate date];
    NSCalendar *calder=[NSCalendar  currentCalendar];
    NSUInteger unyer= NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitWeekday|NSCalendarUnitWeekOfMonth|NSCalendarUnitWeekOfYear|NSCalendarUnitWeekday;
    NSDateComponents *timecount= [calder components:unyer fromDate:datatime];
    
    //获取年、月、日
    NSInteger year =  [timecount year];
    NSInteger month = [timecount month];
    NSInteger day   = [timecount day];
    
    //获取时、分、秒
    NSInteger hour  =  [timecount hour];
    NSInteger minute = [timecount minute];
    NSInteger second = [timecount second];
    
    //一年中的第几周
    NSInteger weekOfYear  =  [timecount weekOfYear];
    NSInteger weekOfMonth  =  [timecount weekOfMonth];
    NSInteger weekday  =  [timecount weekday];