计算时间戳和现在时间对比返回数字

/**

* 是否为今年

*/

- (BOOL)isThisYear

{

NSCalendar *calendar = [NSCalendar currentCalendar];

int unit = NSCalendarUnitYear;

// 1.获得当前时间的年月日

NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];

// 2.获得self的年月日

NSDateComponents *selfCmps = [calendar components:unit fromDate:self];

return nowCmps.year == selfCmps.year;

}

/**

* 是否为今天

*/

- (BOOL)isToday

{

NSCalendar *calendar = [NSCalendar currentCalendar];

int unit = NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear;

// 1.获得当前时间的年月日

NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];

// 2.获得self的年月日

NSDateComponents *selfCmps = [calendar components:unit fromDate:self];

return

(selfCmps.year == nowCmps.year) &&

(selfCmps.month == nowCmps.month) &&

(selfCmps.day == nowCmps.day);

}

/**

* 是否为昨天

*/

- (BOOL)isYesterday

{

NSDate *nowDate = [[NSDate date] dateWithYMD];

NSDate *selfDate = [self dateWithYMD];

// 获得nowDate和selfDate的差距

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *cmps = [calendar components:NSCalendarUnitDay fromDate:selfDate toDate:nowDate options:0];

return cmps.day == 1;

}

+ (NSString *)stringWithTimeStr:(NSString *)timeStr

{

// 1.创建时间格式化工具类

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

// 2.格式时间

// 指定时间的格式

formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";

formatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh"];

NSDate *uploadTime = [formatter dateFromString:timeStr];

// 利用服务器的和本地时间进行对比

NSDateComponents *cmps = [uploadTime deltaWithNow];

if ([uploadTime isThisYear]) {

// 是今年

if ([uploadTime isToday]) {

// 是今天

if (cmps.hour >= 1) {

//其它

formatter.dateFormat = @"HH:mm";

return [formatter stringFromDate:uploadTime];

} else if (cmps.minute <= 1) {

// 刚刚

return @"刚刚";

} else {

// 1个小时内

return [NSString stringWithFormat:@"%ld分钟前", (long)cmps.minute];

}

} else if ([uploadTime isYesterday]) {

// 是昨天

formatter.dateFormat = @"昨天";

return [formatter stringFromDate:uploadTime];

} else {

// 其它天

formatter.dateFormat = @"MM-dd";

return [formatter stringFromDate:uploadTime];

}

} else {

// 不是今年

formatter.dateFormat = @"YY-MM-dd";

return [formatter stringFromDate:uploadTime];

}

return @"1分钟以前";

}