一，怎么查询生产日期
最简单的方式就是网上查！推荐一个还算靠谱的网站：http://checkcosmetic.net。这个网站可以找到大部分品牌的美妆护肤品。
方法很简单，只要先在产品上找到产品的生产批号（一般生产批号都会印在瓶身上）然后在该网站左侧输入该产品的生产批号，网站就会显示该产品的生产日期及保质期总长和剩下的时间。
例如，Lancome：瓶底钢印：产品批号是40MN00：
用上述网址：
Cosmetic Calculator
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Date of manufacture:
November 2015
General shelf life: 36 months
Valid at least for the next
25 months
6码生产日期
第一二两位代表产地，40代表法国
第三位代表年份，一般K代表是2013年；L代表14年；
第四位代表月份，1到9月份用阿拉伯数字表示，O、N、D分别表示10、11、12月
最后两位，代表的是生产线，没有什么意义。
例如 40L500表示2014年5月生产