一、獲取當(dāng)前時(shí)間

//獲取當(dāng)前時(shí)間
- (NSString *)currentDateStr{
    NSDate *currentDate = [NSDate date];//獲取當(dāng)前時(shí)間，日期
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];// 創(chuàng)建一個(gè)時(shí)間格式化對(duì)象
    [dateFormatter setDateFormat:@"YYYY/MM/dd hh:mm:ss SS "];//設(shè)定時(shí)間格式,這里可以設(shè)置成自己需要的格式
    NSString *dateString = [dateFormatter stringFromDate:currentDate];//將時(shí)間轉(zhuǎn)化成字符串
    return dateString;
}

二、獲取當(dāng)前時(shí)間戳

//獲取當(dāng)前時(shí)間戳
- (NSString *)currentTimeStr{
    NSDate* date = [NSDate dateWithTimeIntervalSinceNow:0];//獲取當(dāng)前時(shí)間0秒后的時(shí)間
    NSTimeInterval time=[date timeIntervalSince1970]*1000;// *1000 是精確到毫秒，不乘就是精確到秒
    NSString *timeString = [NSString stringWithFormat:@"%.0f", time];
    return timeString;
}

三、時(shí)間戳轉(zhuǎn)時(shí)間

// 時(shí)間戳轉(zhuǎn)時(shí)間,時(shí)間戳為13位是精確到毫秒的，10位精確到秒
- (NSString *)getDateStringWithTimeStr:(NSString *)str{
    NSTimeInterval time=[str doubleValue]/1000;//傳入的時(shí)間戳str如果是精確到毫秒的記得要/1000
    NSDate *detailDate=[NSDate dateWithTimeIntervalSince1970:time];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; //實(shí)例化一個(gè)NSDateFormatter對(duì)象
    //設(shè)定時(shí)間格式,這里可以設(shè)置成自己需要的格式
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss SS"];
    NSString *currentDateStr = [dateFormatter stringFromDate: detailDate];
    return currentDateStr;
}

四、字符串轉(zhuǎn)時(shí)間戳

//字符串轉(zhuǎn)時(shí)間戳 如：2017-4-10 17:15:10
- (NSString *)getTimeStrWithString:(NSString *)str{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];// 創(chuàng)建一個(gè)時(shí)間格式化對(duì)象
    [dateFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; //設(shè)定時(shí)間的格式
    NSDate *tempDate = [dateFormatter dateFromString:str];//將字符串轉(zhuǎn)換為時(shí)間對(duì)象
    NSString *timeStr = [NSString stringWithFormat:@"%ld", (long)[tempDate timeIntervalSince1970]*1000];//字符串轉(zhuǎn)成時(shí)間戳,精確到毫秒*1000
    return timeStr;
}