NSDate 刚刚、几分钟、几小时

- (NSString *)minutesAgo {

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

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

NSDate *createdDate = [fmt dateFromString:self];

// 判断发送时间 和 现在时间 的差距

if (createdDate.isToday) { // 今天

if (createdDate.deltaWithNow.hour >= 1) {

fmt.dateFormat = @"HH:mm";

return [fmt stringFromDate:createdDate];

} else if (createdDate.deltaWithNow.minute >= 1) {

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

} else {

return @"刚刚";

}

} else if (createdDate.isYesterday) { // 昨天

fmt.dateFormat = @"昨天 HH:mm";

return [fmt stringFromDate:createdDate];

} else if (createdDate.isThisYear) { // 今年(至少是前天)

fmt.dateFormat = @"MM-dd HH:mm";

return [fmt stringFromDate:createdDate];

} else {// 非今年

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

return [fmt stringFromDate:createdDate];

}

}

#pragma mark Comparing Dates

- (BOOL) isEqualToDateIgnoringTime: (NSDate *) aDate

{

NSDateComponents *components1 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:self];

NSDateComponents *components2 = [CURRENT_CALENDAR components:DATE_COMPONENTS fromDate:aDate];

return ((components1.year == components2.year) &&

(components1.month == components2.month) &&

(components1.day == components2.day));

}

- (BOOL) isToday

{

return [self isEqualToDateIgnoringTime:[NSDate date]];

}

- (BOOL) isYesterday

{

return [self isEqualToDateIgnoringTime:[NSDate dateYesterday]];

}

/**

*  获得与当前时间的差距

*/

- (NSDateComponents *)deltaWithNow {

NSCalendar *calendar = [NSCalendar currentCalendar];

int unit = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;

return [calendar components:unit fromDate:self toDate:[NSDate date] options:0];

}

/**

*  是否为今年

*/

- (BOOL)isThisYear {

NSCalendar *calendar = [NSCalendar currentCalendar];

int unit = NSCalendarUnitYear;

// 获得当前时间的年月日

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

// 获得self的年月日

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

return nowCmps.year == selfCmps.year;

}