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Guys - All that website is doing is translating the serial number you provide. I have no way of saying it's doing anything illicit but I'd echo others and say stop giving your serial number out to a random website!

Your serial number is formatted like this AABCCDDDEEF, 'BCC' are the numbers you are all wanting, for example '835', literally meaning '2018, week 35'.

So you can just read your serial number and post the week - you do not need that website.

https://www.cultofmac.com/142948/understand-your-iphones-serial-number/
 
Family name:
Group1: iPhone
Group2: XS
Generation:
EMC number: 0
CPU speed: 2.49GHz
Screen size: 5.8 inch
Screen resolution: 2436x1125 pixels
Colour: Space Gray
Production week : -38- (September)
Production year : -2018-
Model introduced: -2018-
Capacity: 64GB
Memory - flavour: Soldered
Memory - maximum total: 4GB
Factory: C3 (China (Foxxcon, Shenzhen factory))
 
Here is a handy chart that I've copied from one of the other Macrumors threads (iPhone Xs and iPhone Xs Max Antenna Issues Build Date, posted by rebretz000). I used this to determine the build dates for my own and my wife's new iPhone Xs Max phones.
 

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