What's the Date?

Question

Challenge

Weirdly, this hasn't been done yet: output the current date.

Rules

The date format you should follow is as follows:

YYYY-MM-DD

Where the month and day should be padded by zeroes if they are less than 10.

For example, if the program is run on the 24th May 2017, it should output

2017-05-24

The date can either be always in UTC or in the local date.

You must handle leaps years. i.e. in leap years, February has 29 days but 28 days in a normal year.

Winning

Shortest code in bytes wins.

Answer 1

AWK, 17 bytes

$0=strftime("%F")

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Answer 2

jamal, 32 characters

{@format date=YEAR-0M-0D}{@date}

(Only interesting part is jamal's unusual date format specifiers. For example YYYY would mean YY twice, where YY is the year as in Perl, since 1900.)

Sample run:

bash-4.4$ jamal.pl date.jam 
2018-03-19

Answer 3

Gema, 40 characters

\A=@subst{*\\/*\\/*=\$3-\*-\*;@date}@end

Sample run:

bash-4.4$ gema '\A=@subst{*\\/*\\/*=\$3-\*-\*;@date}@end'
2018-03-19

Answer 4

Japt, 5 bytes

AîKs3

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A         :10
 î        :Slice the following to that length
  K       :  Current date & time
   s3     :  Convert to ISO string

Answer 5

Forth (gforth), 52 bytes

: x 0 <# # # #> ." -"type ; : f time&date 1 .r x x ;

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Code Explanation

\ x prints a dash followed by a 2-digit number with leading zeros
: x               \ start a new word definition
  0 <# # # #>     \ convert number to double-precision, then converts to a string with leading 0
  ." -"type       \ print "-" followed by the string from the previous command
;                 \ end the word definition
 
: f               \ start a new word definition
  time&date       \ forth built-in to get the components of a date/time (year on top)
  1 .r            \ print the year (with no space appended)
  x               \ print a dash, followed by the month
  x               \ print a dash, followed by the day
;                 \ end word definition

Answer 6

Nim, 32 bytes

import times
echo ($now())[0..9]

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Answer 7

TI-Basic (TI-84), 32 bytes

Output(1,1,sum(getDate{ᴇ6,ᴇ3,1
Output(1,5,"-
Output(1,8,"-

• getDate is a list in the form {2021, 1, 20}.
• the date list is multiplied by {1e6, 1e3, 1} and then summed, giving a single number in the form yyyy0mm0dd, this deals automatically with leading zeros
• -s are then added at the right places, giving the output yyyy-mm-dd

Answer 8

Thunno 2 h, 3 bytes

kQO

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Explanation

kQ   # Push a string of the current time
     # in the format "YYYY-MM-DD HH:mm:ss"
  O  # Split it on spaces to get the list
     # ["YYYY-MM-DD", "HH:mm:ss"]
     # Implicit output of first item
     # ("YYYY-MM-DD")