iOS 时间戳和时间互换,计算两日期相隔天数

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/*
*获取当前系统时间的时间戳
*/
+(NSInteger)getNowTimestamp;

/**
* 获取当前时间
*/
+ (NSString *)getNowTimeTampFormat:(NSString *)tampFormat;
/*
*时间戳转时间
*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
*/
+(NSString *)timestampSwitchTime:(NSInteger)timestamp andFormatter:(NSString *)format;

/*
*时间戳转时间(时间的前一天)
*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
*/
+(NSString *)timestampSwitchlastTime:(NSInteger)timestamp andFormatter:(NSString *)format;

/*
*时间戳转时间
*formatTime 时间字符串
*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
*/
+ (NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format;
/*
*某日和当前日期相隔多少天
*/
+ (NSInteger)getDifferenceByDate:(NSString *)date;

/**
*日期格式请传入：2013-08-05 12:12:12；如果修改日期格式，比如：2013-08-05，则将[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];修改为[df setDateFormat:@"yyyy-MM-dd"];
*/
+(int)compareDate:(NSString*)date01 withDate:(NSString*)date02;

+(NSInteger)getNowTimestamp{

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

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:@"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

//设置时区,这个对于时间的处理有时很重要

NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];

NSDate *datenow = [NSDate date];//现在时间

// NSLog(@"设备当前的时间:%@",[formatter stringFromDate:datenow]);

//时间转时间戳的方法:

NSInteger timeSp = [[NSNumber numberWithDouble:[datenow timeIntervalSince1970]] integerValue];

// NSLog(@"设备当前的时间戳:%ld",(long)timeSp); //时间戳的值

return timeSp;

}
+ (NSString *)getNowTimeTampFormat:(NSString *)tampFormat {

NSDate *date = [NSDate date];

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

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:tampFormat];
NSString *DateTime = [formatter stringFromDate:date];

return DateTime;
}

//将某个时间戳转化成时间

#pragma mark - 将某个时间戳转化成时间

+(NSString *)timestampSwitchTime:(NSInteger)timestamp andFormatter:(NSString *)format {

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

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:format];
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];
//十三位时间戳转时间需要/1000 十位时间戳你不需要
NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timestamp / 1000];


NSString *confromTimespStr = [formatter stringFromDate:confromTimesp];

// NSLog(@"&&&&&&&confromTimespStr = : %@",confromTimespStr);

return confromTimespStr;

}

/*
*时间戳转时间(时间的前一天)
*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
*/
+(NSString *)timestampSwitchlastTime:(NSInteger)timestamp andFormatter:(NSString *)format {

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

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:format];
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];
//十三位时间戳转时间需要/1000 十位时间戳你不需要
NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timestamp / 1000];

NSDate *lastDay = [NSDate dateWithTimeInterval:(-24*60*60)*2 sinceDate:confromTimesp];//前两天

NSString *confromTimespStr = [formatter stringFromDate:lastDay];

return confromTimespStr;

}

//将某个时间转化成时间戳

#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];
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;
}

+ (NSInteger)getDifferenceByDate:(NSString *)date {
//获得当前时间
// NSDate *now = [NSDate date];
// //实例化一个NSDateFormatter对象
// NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// //设定时间格式
// [dateFormatter setDateFormat:@"YYYY-MM-dd"];
// NSDate *oldDate = [dateFormatter dateFromString:date];
// NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// unsigned int unitFlags = NSDayCalendarUnit;
// NSDateComponents *comps = [gregorian components:unitFlags fromDate:oldDate toDate:now options:0];
// return [comps day];
//
//下面这种方法从00:00:00开始计算
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
NSCalendar *gregorian = [[NSCalendar alloc]
   initWithCalendarIdentifier:NSGregorianCalendar];
[gregorian setFirstWeekday:2];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"YYYY-MM-dd"];
NSDate *fromDate;
NSDate *toDate;
[gregorian rangeOfUnit:NSDayCalendarUnit startDate:&fromDate interval:NULL forDate:[dateFormatter dateFromString:date]];
[gregorian rangeOfUnit:NSDayCalendarUnit startDate:&toDate interval:NULL forDate:[NSDate date]];
NSDateComponents *dayComponents = [gregorian components:NSDayCalendarUnit fromDate:fromDate toDate:toDate options:0];
#pragma clang diagnostic pop

return [dayComponents day];
}

+(int)compareDate:(NSString*)date01 withDate:(NSString*)date02 {
int ci;
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"yyyy-MM-dd"];
NSDate *dt1 = [[NSDate alloc] init];
NSDate *dt2 = [[NSDate alloc] init];
dt1 = [df dateFromString:date01];
dt2 = [df dateFromString:date02];
NSComparisonResult result = [dt1 compare:dt2];
switch (result) {
//date02比date01大
case NSOrderedAscending: ci=1; break;
//date02比date01小
case NSOrderedDescending: ci=-1; break;
//date02=date01
case NSOrderedSame: ci=0; break;
default: NSLog(@"erorr dates %@, %@", dt2, dt1); break;
}
return ci;
}