iOS 时间格式转换、时间戳排序

1、时间格式转换 NSString ~ NSDate、 NSString～NSDate

- (NSDate *)dateFromString:(NSString *)str

{

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

[dateFormat setDateFormat:@"yyyyMMddHHmmss"];

[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];

return [dateFormat dateFromString:str];

}

- (NSString *)stringFromdate:(NSDate *)date

{

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

[dateFormat setDateFormat:@"yyyy-MM-dd"];

[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];

return [dateFormat stringFromDate:date];

}

2、根据时间戳排序