iOS 时间格式转化总结（七种）

#pragma mark - 将某个时间转化成 时间戳

+(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format{

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:format]; //(@"YYYY-MM-dd hh:mm:ss") ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];

NSDate* date = [formatter dateFromString:formatTime]; //------------将字符串按formatter转成nsdate
//时间转时间戳的方法:
NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];

NSLog(@"将某个时间转化成 时间戳&&&&&&&timeSp:%ld",(long)timeSp); //时间戳的值

return timeSp;

}

//时间戳转成时间
//字符串转为时间，时间格式自己定
+(NSString *)timestampSwitchTime:(NSString *)time{
//     NSString * time = @"594947489";//时间字符串
NSInteger num = [time integerValue];//转为int型
NSDateFormatter * formatter = [[NSDateFormatter alloc] init];//时间管理
[formatter setDateStyle:NSDateFormatterMediumStyle];//时间方式
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:@"YYYY-MM-dd"];
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setTimeZone:timeZone];
NSDate * confromTime = [NSDate dateWithTimeIntervalSince1970:num];
NSString * comfromTimeStr = [formatter stringFromDate:confromTime];
NSLog(@"%@",comfromTimeStr);
return comfromTimeStr;

}

//GMT只需要将代码中的UTC替换为GMT即可
//将本地日期字符串转为UTC日期字符串
//本地日期格式:2013-08-03 12:53:51
//可自行指定输入输出格式
+ (NSString *)getUTCFormateLocalDate:(NSString *)localDate { NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
//输入格式
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *dateFormatted = [dateFormatter dateFromString:localDate];NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"UTC"]; [dateFormatter setTimeZone:timeZone];
//输出格式
[dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZ"];
NSString *dateString = [dateFormatter stringFromDate:dateFormatted];
return dateString;
}

//将UTC日期字符串转为本地时间字符串
//输入的UTC日期格式2013-08-03T04:53:51+0000
+ (NSString *)getLocalDateFormateUTCDate:(NSString *)utcDate { NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
//输入格式
[dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZ"]; NSTimeZone *localTimeZone = [NSTimeZone localTimeZone]; [dateFormatter setTimeZone:localTimeZone];
NSDate *dateFormatted = [dateFormatter dateFromString:utcDate];
//输出格式
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *dateString = [dateFormatter stringFromDate:dateFormatted];
return dateString;
}

//将GMT日期字符串转为本地时间字符串
//输入的GMT日期格式Tue May 31 17:46:55 +0800 2011
+ (NSString *)getLocalDateFormateGMTDate:(NSString *)gmtDate{
// 时间字符串
//    NSString *string = @"Tue May 31 17:46:55 +0800 2011";
// 日期格式化类
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"EEE MMM dd HH:mm:ss Z yyyy";
//fmt.dateFormat = @"EEE MMM dd HH:mm:ss ZZZZ yyyy";
// 设置语言区域
NSTimeZone *localTimeZone = [NSTimeZone localTimeZone]; [dateFormatter setTimeZone:localTimeZone];
NSDate *dateFormatted = [dateFormatter dateFromString:gmtDate];

//输出格式
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *dateString = [dateFormatter stringFromDate:dateFormatted];
return dateString;
}

//方式二 后台给的格式为 纯数字1352170595000(13位)
+(NSString *)updateTimeForRow:(NSString *)str {
// 获取当前时时间戳 1466386762.345715 十位整数 6位小数
NSTimeInterval currentTime = [[NSDate date] timeIntervalSince1970];
// 创建歌曲时间戳(后台返回的时间 一般是13位数字)
NSTimeInterval createTime =[str floatValue]/1000;
// 时间差
NSTimeInterval time = currentTime - createTime;

//秒转分钟
NSInteger small = time / 60;
if (small == 0) {
return [NSString stringWithFormat:@"刚刚"];
}

if (small < 60) {
return [NSString stringWithFormat:@"%ld分钟前",small];
}

// 秒转小时
NSInteger hours = time/3600;
if (hours<24) {
return [NSString stringWithFormat:@"%ld小时前",hours];
}
//秒转天数
NSInteger days = time/3600/24;
if (days < 30) {
return [NSString stringWithFormat:@"%ld天前",days];
}
//秒转月
NSInteger months = time/3600/24/30;
if (months < 12) {
return [NSString stringWithFormat:@"%ld月前",months];
}
//秒转年
NSInteger years = time/3600/24/30/12;
return [NSString stringWithFormat:@"%ld年前",years];
}

//方式一 后台给的格式为yyyy-MM-dd HH:mm:ss.SSS
+(NSString *) compareCurrentTime:(NSString *)str
{
//把字符串转为NSdate
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *timeDate = [dateFormatter dateFromString:str];
NSDate *currentDate = [NSDate date];

//得到两个时间差
NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:timeDate];
long temp = 0;
NSString *result;
if (timeInterval/60 < 1)
{
result = [NSString stringWithFormat:@"刚刚"];
}
else if((temp = timeInterval/60) <60){
result = [NSString stringWithFormat:@"%ld分钟前",temp];
}
else if((temp = temp/60) <24){
result = [NSString stringWithFormat:@"%ld小时前",temp];
}
else if((temp = temp/24) <30){
result = [NSString stringWithFormat:@"%ld天前",temp];
}
else if((temp = temp/30) <12){
result = [NSString stringWithFormat:@"%ld月前",temp];
} else{
temp = temp/12;
result = [NSString stringWithFormat:@"%ld年前",temp];
}
return  result;
}