iOS：时间格式化（标准时间转为时间戳、时间戳转为标准时间、时间戳转为日期）

#import <Foundation/Foundation.h>

@interface NSString (KJTime)
//时间戳--->时间
+(NSString *)transToTime:(NSString *)timsp;

//时间戳--->日期
+(NSString *)transToDate:(NSString *)timsp;

//时间---->时间戳
+(NSString *)transTotimeSp:(NSString *)time;

@end

#import "NSString+KJTime.h"

@implementation NSString (KJTime)

//时间戳--->时间
+(NSString *)transToTime:(NSString *)timsp{

    NSTimeInterval time=[timsp doubleValue];//如果不使用本地时区,因为时差问题要加8小时 == 28800 sec
    NSDate *detaildate=[NSDate dateWithTimeIntervalSince1970:time];

    //实例化一个NSDateFormatter对象
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeZone:[NSTimeZone localTimeZone]];//设置本地时区
    //设定时间格式,这里可以设置成自己需要的格式
    [dateFormatter setDateFormat:@"MM/dd HH:mm"];
    
    NSString *currentDateStr = [dateFormatter stringFromDate: detaildate];
    
    return currentDateStr;
}

//时间戳--->日期
+(NSString *)transToDate:(NSString *)timsp{
    
    NSTimeInterval time=[timsp doubleValue];//如果不使用本地时区,因为时差问题要加8小时 == 28800 sec
    NSDate *detaildate=[NSDate dateWithTimeIntervalSince1970:time];

    //实例化一个NSDateFormatter对象
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeZone:[NSTimeZone localTimeZone]];//设置本地时区
    //设定时间格式,这里可以设置成自己需要的格式
    [dateFormatter setDateFormat:@"MM月dd日"];
    
    NSString *currentDateStr = [dateFormatter stringFromDate: detaildate];
    
    return currentDateStr;
}

//时间---->时间戳
+(NSString *)transTotimeSp:(NSString *)time{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeZone:[NSTimeZone localTimeZone]]; //设置本地时区
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];
    NSDate *date = [dateFormatter dateFromString:time];
    NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[date timeIntervalSince1970]];//时间戳
    return timeSp;
}
@end