Find Dates

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Points: 7
Time limit: 1.0s
Memory limit: 64M

Problem type
Allowed languages
Ada, Assembly, Awk, Brain****, C, C#, C++, COBOL, CommonLisp, D, Dart, F#, Forth, Fortran, Go, Groovy, Haskell, Intercal, Java, JS, Kotlin, Lisp, Lua, Nim, ObjC, OCaml, Octave, Pascal, Perl, PHP, Pike, Prolog, Python, Racket, Ruby, Rust, Scala, Scheme, Sed, Swift, TCL, Text, Turing, VB, Zig

I have a document full of dates that you need to process. I am really busy, so I need you to write a program for me to find all the dates. I only want valid dates, that is dates that actually exist, in the format YYYY-MM-DD exactly. Any date that does not fit exactly in YYYY-MM-DD or does not actually exist must be ignored. A valid date will also be have non-alphanumeric characters on both sides.

Note: Leap years are very important for me.

Input Specification

The first line is an integer N, the number of lines in the input. The next N lines will be the document you need to process.

Output Specification

You are to output all valid dates in the exact format YYYY-MM-DD inside the document.

Sample Input

Archduke Franz Ferdinand was killed on 1914-06-28. On 1914-07-28,
Austria-Hungary declared war on Serbia. Germany attacked Luxemburg on 08-02,
and war was declared on France on 1914-08-03. On 04-08-1914, Britain declared

Sample Output



  • 2
    faraz123  commented on Sept. 5, 2020, 3:47 p.m.

    My output matches the sample output exactly (for TC 1). Is TC1 different than the sample?

    • 2
      Kirito  commented on Sept. 5, 2020, 4:01 p.m.
      1. Yes, the test case is different from the sample (you can verify this by submitting the sample output in Text.)
      2. Your logic for handling leap years is wrong.

  • 1
    abcConjecture  commented on Sept. 25, 2017, 7:49 p.m.

    What am I missing? My date validation seems correct and since the dates can't be surrounded by alphanumeric characters, the word boundaries should be fine too.

  • 0
    kobortor  commented on June 9, 2015, 12:07 a.m.

    Why does the judge crash with my submissions? It works perfectly fine when I use it at my own computer.

    BTW I'm using VS2013 not code blocks so that might be different.

  • 1
    BMP  commented on June 8, 2015, 10:11 p.m.

    Does the order in which the dates are outputted matter?

    • 0
      Xyene  commented on June 9, 2015, 12:01 a.m.


  • 10
    bobhob314  commented on Jan. 30, 2015, 7:11 p.m.

    I had to use this for reference.


  • 1
    Walt28  commented on Dec. 7, 2014, 10:03 p.m.

    The judge reports wrong answer back to me, but the output looks correct. Any tips on how to solve?

    • 1
      BMP  commented on Dec. 8, 2014, 11:15 a.m.

      Same issue here..

      • 0
        quantum  commented on Dec. 8, 2014, 11:28 p.m.

        Read the problem statement more carefully, as there's something you're missing.

        • 0
          BMP  commented on Dec. 11, 2014, 12:46 a.m.

          I see it now, it's the format of output

          • -1
            Walt28  commented on Dec. 13, 2014, 12:38 p.m.

            Could you elaborate on that please?

            • 0
              Xyene  commented on Dec. 13, 2014, 12:56 p.m.

              Carefully re-read the second sentence of the problem statement. There's something you're missing.

  • -1
    BMP  commented on Dec. 7, 2014, 2:21 p.m.

    Weird, it gives the right output and doesn't crash on my computer. But the judge says it gets out of bounds exception?

    • -1
      FatalEagle  commented on Dec. 7, 2014, 3:22 p.m.

      Make your own corner cases to run your solution on.

  • 10
    quantum  commented on Sept. 27, 2014, 9:45 p.m. edited

    • 2
      PaulOlteanu  commented on Dec. 8, 2014, 6:29 p.m.

      I like how you support the alt-text without having to click through to the comic.