In multiple fanarts and fanfic websites of Full Metal Alchemist, I have seen mentions of the "503 day". Here's an example:

Edward & Winry 503

I did read and watch Full Metal Alchemist and Full Metal Alchemist Brotherhood and I do not remember any mention of such a date. It does not match with the date Ed engraved into his State Alchemist Pocket Watch either.

What does the "503 day" refer to?

  • 503 is Service unavailable, as most of us have seen in almost any website time to time.
    – h22
    Sep 18, 2017 at 19:56
  • 3
    @h22 I don't think this have any sense in this particular context, thought
    – Ikaros
    Sep 19, 2017 at 7:22
  • This is exactly that I think about when I see the number. I have never seen this number in any other context, and this is one of the two most common error codes, other being 404 (not found). While lots of them defined, others are rare (200 is Ok). But I agree might be just by chance.
    – h22
    Sep 19, 2017 at 8:10

1 Answer 1


503 day is supposed to be the 3rd of May (5/03), which is the Edward x Winry day, or Edwin day in short.

There are two reasons for this coming into existence.

First, there's a jeans brand called Edwin and one of their logos contains the number 503.

enter image description here

Second, when Winry goes to Central City she's in room 503 of the hotel.

  • 5
    Out of curiosity, do you know where/when did this date start becoming a thing?
    – Ikaros
    Sep 18, 2017 at 13:18
  • 4
    @Ikaros I haven't found who and when used it first. But as I was reading around people were saying the author liked this brand of jeans and he put the room number into the series as something like a "confirmation". I know Winry was staying in Central City around chapter 45 I think, meaning this "day 503" thing is quite old. The oldest submission I found with this tag on deviantart is from is 2005.
    – Gorzius
    Sep 18, 2017 at 15:33

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