// 时间比较
// 1.过去时间
NSString *str = @"2017-01-11 15:48:52 +0000";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy-MM-dd HH-mm-ss Z";
NSDate *date = [dateFormatter dateFromString:str];
NSLog(@"%@", date);
// 2.现在时间
NSDate *nowDate = [NSDate date];
// 比较两个时间
NSCalendar *calendar = [NSCalendar currentCalendar];
NSCalendarUnit type = NSCalendarUnitYear |
NSCalendarUnitMonth |
NSCalendarUnitDay |
NSCalendarUnitHour |
NSCalendarUnitMinute |
NSCalendarUnitSecond;
NSDateComponents *comp = [calendar components:type fromDate:date toDate:nowDate options:0];
NSLog(@"year = %ld month = %ld day = %ld hour = %ld minute = %ld second = %ld", (long)comp.year, (long)comp.month, (long)comp.day, (long)comp.hour, (long)comp.minute, (long)comp.second);
