How to write a better function for validating date in ruby in yyyy-mm-dd format?-CodePudding

I have tried many ways of writing a validate date function in ruby which handles all the edge cases like , if the current date is valid according to leap year, and also if the date is passed in invalid format like 20-05-2022 it should return false , it should only valid format of date in yyyy-mm-dd format.

Functions I tried before asking here(this function I got from one of the Stackoverflow link):

require 'date'

def validate_date?(string)
  date_format = '%Y-%m-%d'
  DateTime.strptime(date, date_format)
  true
rescue ArgumentError
  false
end

But the problem with this function is it is not able to handle some of the invalid date formats like :

validate_date('202200-06-02')  -> returns true (As the date is in incorrect format)
validate_date('2022-060-002')  -> returns true (As the date is in incorrect format)

I want to return false if these invalid date formats are applied.

Any suggestions or improvements are welcome, or even what else should I try to write a proper validate_date function which can be used for all kinds of edge cases.

CodePudding user response：

If you are using Rails you can use method to_date in combination with regexp

def valid_date?(string)
  !!(string.to_date && /^\d{4}-\d{1,2}-\d{1,2}$/ =~ string)
rescue Date::Error
  false
end

If you are not

require 'date'

def valid_date?(string)
  !!(Date.parse(string) && /^\d{4}-\d{1,2}-\d{1,2}$/ =~ string)
rescue Date::Error
  false
end