时间转换 nsdate

+(NSString *)formatTime:(NSDate *)time

{

NSTimeInterval diff=-[time timeIntervalSinceNow];

if (diff<60) {

return @"刚刚";

}else if(diff<60*60){

int minute=diff/60;

return [NSString stringWithFormat:@"%d分钟以内",minute];

}else if(diff<24*60*60){

int hour=diff/(60*60);

return [NSString stringWithFormat:@"%d小时以内",hour];

}else{

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

[dateFormatter setDateFormat: @"MM-dd"];

NSString *timeStr=[dateFormatter stringFromDate:time];

return timeStr;

}

}

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