Is the date alphabetical?

Clash Royale CLAN TAG#URR8PPP

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Write a function or program that accepts a date (as a string in YYYY-MM-DD format) as input and returns a truthy value if that date is "alphabetical," and a falsey value if it isn't.

An alphabetical date is a date whose month, day and year are in alphabetical order when expressed as a string (and when considered specifically in M - D - Y order). For example, Sept. 26 2018 is an alphabetical date:

September 26th 2018 -> September twenty-sixth two thousand eighteen

September
Twenty-sixth
Two thousand eighteen

Another way to think of this challenge: "are the elements of a given date lexically sorted?"

Notes:

• 2018 is represented as "two thousand eighteen," not "twenty eighteen" or "two zero one eight."


• 26th is represented as "twenty-sixth," not "twenty-six."


• Each element of the date is considered as a whole. This is why 2018 doesn't automatically fail even though the "e" in eighteen comes before the "t" in two.

The following dates are not alphabetical:

• September 2nd 2018 ("second" should sort ahead of "September")


• April 30th 4000 ("four thousand" should sort ahead of "thirtieth")

Additional Rules:

• You will receive the date as a string, formatted like YYYY-MM-DD. The year will always have four digits, and the month and day will always have two digits each. Zero-padding is not represented in the string conversion (e.g., '2000-01-01' is 'January first two thousand' as you'd expect).


• You may assume that dates will always be valid (no February 30th, no Smarch 1st) and that the value of the year will be positive (no dates B.C.), but the date may be far in the future ("in the year two nine thousand...").


• You should return a truthy or falsey value, not necessarily a boolean True or False. If you do this in Javascript and want to return '0' and 0 that's fine. Of course, if you want to return a boolean, feel free.


• Standard loopholes are forbidden.


• This is code-golf

More Examples of Alphabetical Dates

• 2066-01-02 (January second, two thousand sixty-six)


• 1000-04-08 (April eighth, one thousand)


• 6000-08-01 (August first, six thousand)

More Examples of Non-Alphabetical Dates

• 1066-01-02 (January second, one thousand sixty-six)


• 1000-04-07 (April seventh, one thousand)


• 8000-08-01 (August first, eight thousand)

code-golf

share|improve this question

edited 1 hour ago

asked 2 hours ago

souldeux

1896

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Lousy Smarch weather.
  – AdmBorkBork
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Arnauld Um, no? Looks like 2018-09-02 is falsy, while 2018-09-26 is truthy (when given as in the question).
  – Erik the Outgolfer
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @EriktheOutgolfer Right. I totally misread the challenge. (Maybe it should be rephrased as Is the date lexically sorted? or something like that.)
  – Arnauld
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Arnauld I tweaked the first paragraph and included a line with your suggested wording a bit further in, hopefully to the delight of future readers. Thank you!
  – souldeux
  2 hours ago
  

  
  
  
  

add a comment | 

up vote
5
down vote

favorite

Write a function or program that accepts a date (as a string in YYYY-MM-DD format) as input and returns a truthy value if that date is "alphabetical," and a falsey value if it isn't.

An alphabetical date is a date whose month, day and year are in alphabetical order when expressed as a string (and when considered specifically in M - D - Y order). For example, Sept. 26 2018 is an alphabetical date:

September 26th 2018 -> September twenty-sixth two thousand eighteen

September
Twenty-sixth
Two thousand eighteen

Another way to think of this challenge: "are the elements of a given date lexically sorted?"

Notes:

• 2018 is represented as "two thousand eighteen," not "twenty eighteen" or "two zero one eight."


• 26th is represented as "twenty-sixth," not "twenty-six."


• Each element of the date is considered as a whole. This is why 2018 doesn't automatically fail even though the "e" in eighteen comes before the "t" in two.

The following dates are not alphabetical:

• September 2nd 2018 ("second" should sort ahead of "September")


• April 30th 4000 ("four thousand" should sort ahead of "thirtieth")

Additional Rules:

• You will receive the date as a string, formatted like YYYY-MM-DD. The year will always have four digits, and the month and day will always have two digits each. Zero-padding is not represented in the string conversion (e.g., '2000-01-01' is 'January first two thousand' as you'd expect).


• You may assume that dates will always be valid (no February 30th, no Smarch 1st) and that the value of the year will be positive (no dates B.C.), but the date may be far in the future ("in the year two nine thousand...").


• You should return a truthy or falsey value, not necessarily a boolean True or False. If you do this in Javascript and want to return '0' and 0 that's fine. Of course, if you want to return a boolean, feel free.


• Standard loopholes are forbidden.


• This is code-golf

More Examples of Alphabetical Dates

• 2066-01-02 (January second, two thousand sixty-six)


• 1000-04-08 (April eighth, one thousand)


• 6000-08-01 (August first, six thousand)

More Examples of Non-Alphabetical Dates

• 1066-01-02 (January second, one thousand sixty-six)


• 1000-04-07 (April seventh, one thousand)


• 8000-08-01 (August first, eight thousand)

code-golf

share|improve this question

edited 1 hour ago

asked 2 hours ago

souldeux

1896

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Lousy Smarch weather.
  – AdmBorkBork
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Arnauld Um, no? Looks like 2018-09-02 is falsy, while 2018-09-26 is truthy (when given as in the question).
  – Erik the Outgolfer
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @EriktheOutgolfer Right. I totally misread the challenge. (Maybe it should be rephrased as Is the date lexically sorted? or something like that.)
  – Arnauld
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Arnauld I tweaked the first paragraph and included a line with your suggested wording a bit further in, hopefully to the delight of future readers. Thank you!
  – souldeux
  2 hours ago
  

  
  
  
  

add a comment | 

up vote
5
down vote

favorite

up vote
5
down vote

favorite

Write a function or program that accepts a date (as a string in YYYY-MM-DD format) as input and returns a truthy value if that date is "alphabetical," and a falsey value if it isn't.

An alphabetical date is a date whose month, day and year are in alphabetical order when expressed as a string (and when considered specifically in M - D - Y order). For example, Sept. 26 2018 is an alphabetical date:

September 26th 2018 -> September twenty-sixth two thousand eighteen

September
Twenty-sixth
Two thousand eighteen

Another way to think of this challenge: "are the elements of a given date lexically sorted?"

Notes:

• 2018 is represented as "two thousand eighteen," not "twenty eighteen" or "two zero one eight."


• 26th is represented as "twenty-sixth," not "twenty-six."


• Each element of the date is considered as a whole. This is why 2018 doesn't automatically fail even though the "e" in eighteen comes before the "t" in two.

The following dates are not alphabetical:

• September 2nd 2018 ("second" should sort ahead of "September")


• April 30th 4000 ("four thousand" should sort ahead of "thirtieth")

Additional Rules:

• You will receive the date as a string, formatted like YYYY-MM-DD. The year will always have four digits, and the month and day will always have two digits each. Zero-padding is not represented in the string conversion (e.g., '2000-01-01' is 'January first two thousand' as you'd expect).


• You may assume that dates will always be valid (no February 30th, no Smarch 1st) and that the value of the year will be positive (no dates B.C.), but the date may be far in the future ("in the year two nine thousand...").


• You should return a truthy or falsey value, not necessarily a boolean True or False. If you do this in Javascript and want to return '0' and 0 that's fine. Of course, if you want to return a boolean, feel free.


• Standard loopholes are forbidden.


• This is code-golf

More Examples of Alphabetical Dates

• 2066-01-02 (January second, two thousand sixty-six)


• 1000-04-08 (April eighth, one thousand)


• 6000-08-01 (August first, six thousand)

More Examples of Non-Alphabetical Dates

• 1066-01-02 (January second, one thousand sixty-six)


• 1000-04-07 (April seventh, one thousand)


• 8000-08-01 (August first, eight thousand)

code-golf

share|improve this question

edited 1 hour ago

asked 2 hours ago

souldeux

1896

Write a function or program that accepts a date (as a string in YYYY-MM-DD format) as input and returns a truthy value if that date is "alphabetical," and a falsey value if it isn't.

An alphabetical date is a date whose month, day and year are in alphabetical order when expressed as a string (and when considered specifically in M - D - Y order). For example, Sept. 26 2018 is an alphabetical date:

September 26th 2018 -> September twenty-sixth two thousand eighteen

September
Twenty-sixth
Two thousand eighteen

Another way to think of this challenge: "are the elements of a given date lexically sorted?"

Notes:

• 2018 is represented as "two thousand eighteen," not "twenty eighteen" or "two zero one eight."


• 26th is represented as "twenty-sixth," not "twenty-six."


• Each element of the date is considered as a whole. This is why 2018 doesn't automatically fail even though the "e" in eighteen comes before the "t" in two.

The following dates are not alphabetical:

• September 2nd 2018 ("second" should sort ahead of "September")


• April 30th 4000 ("four thousand" should sort ahead of "thirtieth")

Additional Rules:

• You will receive the date as a string, formatted like YYYY-MM-DD. The year will always have four digits, and the month and day will always have two digits each. Zero-padding is not represented in the string conversion (e.g., '2000-01-01' is 'January first two thousand' as you'd expect).


• You may assume that dates will always be valid (no February 30th, no Smarch 1st) and that the value of the year will be positive (no dates B.C.), but the date may be far in the future ("in the year two nine thousand...").


• You should return a truthy or falsey value, not necessarily a boolean True or False. If you do this in Javascript and want to return '0' and 0 that's fine. Of course, if you want to return a boolean, feel free.


• Standard loopholes are forbidden.


• This is code-golf

More Examples of Alphabetical Dates

• 2066-01-02 (January second, two thousand sixty-six)


• 1000-04-08 (April eighth, one thousand)


• 6000-08-01 (August first, six thousand)

More Examples of Non-Alphabetical Dates

• 1066-01-02 (January second, one thousand sixty-six)


• 1000-04-07 (April seventh, one thousand)


• 8000-08-01 (August first, eight thousand)

code-golf

code-golf

share|improve this question

edited 1 hour ago

asked 2 hours ago

souldeux

1896

share|improve this question

edited 1 hour ago

asked 2 hours ago

souldeux

1896

share|improve this question

share|improve this question

edited 1 hour ago

edited 1 hour ago

edited 1 hour ago

asked 2 hours ago

souldeux

1896

asked 2 hours ago

souldeux

1896

asked 2 hours ago

souldeux

1896

1896

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Lousy Smarch weather.
  – AdmBorkBork
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Arnauld Um, no? Looks like 2018-09-02 is falsy, while 2018-09-26 is truthy (when given as in the question).
  – Erik the Outgolfer
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @EriktheOutgolfer Right. I totally misread the challenge. (Maybe it should be rephrased as Is the date lexically sorted? or something like that.)
  – Arnauld
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Arnauld I tweaked the first paragraph and included a line with your suggested wording a bit further in, hopefully to the delight of future readers. Thank you!
  – souldeux
  2 hours ago
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Lousy Smarch weather.
  – AdmBorkBork
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Arnauld Um, no? Looks like 2018-09-02 is falsy, while 2018-09-26 is truthy (when given as in the question).
  – Erik the Outgolfer
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @EriktheOutgolfer Right. I totally misread the challenge. (Maybe it should be rephrased as Is the date lexically sorted? or something like that.)
  – Arnauld
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Arnauld I tweaked the first paragraph and included a line with your suggested wording a bit further in, hopefully to the delight of future readers. Thank you!
  – souldeux
  2 hours ago
  

  
  
  
  

1

1

Lousy Smarch weather.
– AdmBorkBork
2 hours ago

Lousy Smarch weather.
– AdmBorkBork
2 hours ago

@Arnauld Um, no? Looks like 2018-09-02 is falsy, while 2018-09-26 is truthy (when given as in the question).
– Erik the Outgolfer
2 hours ago

@Arnauld Um, no? Looks like 2018-09-02 is falsy, while 2018-09-26 is truthy (when given as in the question).
– Erik the Outgolfer
2 hours ago

@EriktheOutgolfer Right. I totally misread the challenge. (Maybe it should be rephrased as Is the date lexically sorted? or something like that.)
– Arnauld
2 hours ago

@EriktheOutgolfer Right. I totally misread the challenge. (Maybe it should be rephrased as Is the date lexically sorted? or something like that.)
– Arnauld
2 hours ago

@Arnauld I tweaked the first paragraph and included a line with your suggested wording a bit further in, hopefully to the delight of future readers. Thank you!
– souldeux
2 hours ago

@Arnauld I tweaked the first paragraph and included a line with your suggested wording a bit further in, hopefully to the delight of future readers. Thank you!
– souldeux
2 hours ago

add a comment | 

2 Answers
2

active

oldest

votes

up vote
2
down vote

JavaScript (ES6), 102 bytes

Saved 4 bytes thanks to @Shaggy

Returns $0$ or $1$.

s=>'_414044406550'[[,m,d]=s.split`-`,+m]<(d=`_268328715819832871$6e10-188`[+d])&d<'_6A9338704'[s[0]]

Try it online!

share|improve this answer

edited 10 mins ago

answered 1 hour ago

Arnauld

65k581274

• 
  
  
  

  
  

  
  
  
  
  
  

  
  104 bytes
  – Shaggy
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Shaggy Oops... This m= was, of course, completely useless. Thanks. :)
  – Arnauld
  1 hour ago
  
  

  
  
  
  

add a comment | 

up vote
0
down vote

Wolfram Language 160 bytes

Returns True or False.

(t=ToExpression;i=IntegerName;d=StringSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]/.m_,d_,y_:> m,i@t@d,t@y~i~"Words";d==Sort@d)&

Explanation, in steps

StrtingSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]&["2018-09-26"]

returns

"September", "26", "2018"

/.m_,d_,y_:> m,IntegerName@ToExpression@d,ToExpression@y~IntegerName~"Words"

replaces the output with

"September", "twenty-six", "two thousand, eighteen"

and assigns this list of strings to d.

d=Sort@d returns True if the list, d, is lexically sorted; otherwise it returns False.

share|improve this answer

answered 1 hour ago

DavidC

23.5k243100

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
2
down vote

JavaScript (ES6), 102 bytes

Saved 4 bytes thanks to @Shaggy

Returns $0$ or $1$.

s=>'_414044406550'[[,m,d]=s.split`-`,+m]<(d=`_268328715819832871$6e10-188`[+d])&d<'_6A9338704'[s[0]]

Try it online!

share|improve this answer

edited 10 mins ago

answered 1 hour ago

Arnauld

65k581274

• 
  
  
  

  
  

  
  
  
  
  
  

  
  104 bytes
  – Shaggy
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Shaggy Oops... This m= was, of course, completely useless. Thanks. :)
  – Arnauld
  1 hour ago
  
  

  
  
  
  

add a comment | 

up vote
2
down vote

JavaScript (ES6), 102 bytes

Saved 4 bytes thanks to @Shaggy

Returns $0$ or $1$.

s=>'_414044406550'[[,m,d]=s.split`-`,+m]<(d=`_268328715819832871$6e10-188`[+d])&d<'_6A9338704'[s[0]]

Try it online!

share|improve this answer

edited 10 mins ago

answered 1 hour ago

Arnauld

65k581274

• 
  
  
  

  
  

  
  
  
  
  
  

  
  104 bytes
  – Shaggy
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Shaggy Oops... This m= was, of course, completely useless. Thanks. :)
  – Arnauld
  1 hour ago
  
  

  
  
  
  

add a comment | 

up vote
2
down vote

up vote
2
down vote

JavaScript (ES6), 102 bytes

Saved 4 bytes thanks to @Shaggy

Returns $0$ or $1$.

s=>'_414044406550'[[,m,d]=s.split`-`,+m]<(d=`_268328715819832871$6e10-188`[+d])&d<'_6A9338704'[s[0]]

Try it online!

share|improve this answer

edited 10 mins ago

answered 1 hour ago

Arnauld

65k581274

JavaScript (ES6), 102 bytes

Saved 4 bytes thanks to @Shaggy

Returns $0$ or $1$.

s=>'_414044406550'[[,m,d]=s.split`-`,+m]<(d=`_268328715819832871$6e10-188`[+d])&d<'_6A9338704'[s[0]]

Try it online!

share|improve this answer

edited 10 mins ago

answered 1 hour ago

Arnauld

65k581274

share|improve this answer

share|improve this answer

edited 10 mins ago

edited 10 mins ago

edited 10 mins ago

answered 1 hour ago

Arnauld

65k581274

answered 1 hour ago

Arnauld

65k581274

answered 1 hour ago

Arnauld

65k581274

65k581274

• 
  
  
  

  
  

  
  
  
  
  
  

  
  104 bytes
  – Shaggy
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Shaggy Oops... This m= was, of course, completely useless. Thanks. :)
  – Arnauld
  1 hour ago
  
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  104 bytes
  – Shaggy
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @Shaggy Oops... This m= was, of course, completely useless. Thanks. :)
  – Arnauld
  1 hour ago
  
  

  
  
  
  

104 bytes
– Shaggy
1 hour ago

104 bytes
– Shaggy
1 hour ago

@Shaggy Oops... This m= was, of course, completely useless. Thanks. :)
– Arnauld
1 hour ago

@Shaggy Oops... This m= was, of course, completely useless. Thanks. :)
– Arnauld
1 hour ago

add a comment | 

up vote
0
down vote

Wolfram Language 160 bytes

Returns True or False.

(t=ToExpression;i=IntegerName;d=StringSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]/.m_,d_,y_:> m,i@t@d,t@y~i~"Words";d==Sort@d)&

Explanation, in steps

StrtingSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]&["2018-09-26"]

returns

"September", "26", "2018"

/.m_,d_,y_:> m,IntegerName@ToExpression@d,ToExpression@y~IntegerName~"Words"

replaces the output with

"September", "twenty-six", "two thousand, eighteen"

and assigns this list of strings to d.

d=Sort@d returns True if the list, d, is lexically sorted; otherwise it returns False.

share|improve this answer

answered 1 hour ago

DavidC

23.5k243100

add a comment | 

up vote
0
down vote

Wolfram Language 160 bytes

Returns True or False.

(t=ToExpression;i=IntegerName;d=StringSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]/.m_,d_,y_:> m,i@t@d,t@y~i~"Words";d==Sort@d)&

Explanation, in steps

StrtingSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]&["2018-09-26"]

returns

"September", "26", "2018"

/.m_,d_,y_:> m,IntegerName@ToExpression@d,ToExpression@y~IntegerName~"Words"

replaces the output with

"September", "twenty-six", "two thousand, eighteen"

and assigns this list of strings to d.

d=Sort@d returns True if the list, d, is lexically sorted; otherwise it returns False.

share|improve this answer

answered 1 hour ago

DavidC

23.5k243100

add a comment | 

up vote
0
down vote

up vote
0
down vote

Wolfram Language 160 bytes

Returns True or False.

(t=ToExpression;i=IntegerName;d=StringSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]/.m_,d_,y_:> m,i@t@d,t@y~i~"Words";d==Sort@d)&

Explanation, in steps

StrtingSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]&["2018-09-26"]

returns

"September", "26", "2018"

/.m_,d_,y_:> m,IntegerName@ToExpression@d,ToExpression@y~IntegerName~"Words"

replaces the output with

"September", "twenty-six", "two thousand, eighteen"

and assigns this list of strings to d.

d=Sort@d returns True if the list, d, is lexically sorted; otherwise it returns False.

share|improve this answer

answered 1 hour ago

DavidC

23.5k243100

Wolfram Language 160 bytes

Returns True or False.

(t=ToExpression;i=IntegerName;d=StringSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]/.m_,d_,y_:> m,i@t@d,t@y~i~"Words";d==Sort@d)&

Explanation, in steps

StrtingSplit@DateString[Interpreter["Date"]@#,"MonthName"," ","Day"," ","Year"]&["2018-09-26"]

returns

"September", "26", "2018"

/.m_,d_,y_:> m,IntegerName@ToExpression@d,ToExpression@y~IntegerName~"Words"

replaces the output with

"September", "twenty-six", "two thousand, eighteen"

and assigns this list of strings to d.

d=Sort@d returns True if the list, d, is lexically sorted; otherwise it returns False.

share|improve this answer

answered 1 hour ago

DavidC

23.5k243100

share|improve this answer

share|improve this answer

answered 1 hour ago

DavidC

23.5k243100

answered 1 hour ago

DavidC

23.5k243100

answered 1 hour ago

DavidC

23.5k243100

23.5k243100

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