Modify date string with javascript

Question

I have some events that pulls its date like the following:

20th June 10am - 5th September 10pm

28th September noon - 4pm

I've not control of what it returns, so I need to remove it via javascript

I need to remove the time and replace the months with 3 character version, like the below:

20th Jun - 5th Sep

I've started doing it but I don't know how to remove the time, because it could be either formatted with AM/PM or MIDNIGHT/NOON

This is what I've done so far:

var dateExample = '2nd August 9am - 27th September midnight';
function trimDate(date){
  const dateArray = date.split(' ');
  var months = [['January', 'Jan'], ['February', 'Feb'], ['March', 'Mar'], ['April', 'Apr'], ['May', 'May'], ['June', 'Jun'], ['July', 'Jul'], ['August', 'Aug'], ['September', 'Sep'], ['October', 'Oct'], ['November', 'Nov'], ['December', 'Dec']];

  for (let x = 0; x < months.length; x++){
    let i = dateArray.findIndex(d => d === months[x][0]);
    if (i > -1) dateArray.splice(i, 1, months[x][1]);
  }
  console.log(dateArray.join(' '));
}

trimDate(dateExample);

Will Jenkins · Accepted Answer · 2019-08-30 14:36:44Z

1

It looks like it should be possible with a single regex:

const dateExamples = [
  '2nd August 9am - 27th September midnight',
  '20th June 10am - 5th September 10pm',
  '2nd August noon - 27th September midnight'
]
const regex = /[0-9]{1,2}[ndrths]{2}[\s]{1}[\w]{3}/g
dateExamples.forEach(dateExample => console.log(dateExample.match(regex).join(' - ')))

answered Aug 30, 2019 at 14:36

Will Jenkins

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2 Comments

Jamiec Over a year ago

Much better than my weak attempt

Will Jenkins Over a year ago

ha, yours was helpful actually!

Jamiec · Accepted Answer · 2019-08-30 14:23:52Z

Replacing the dates can be done much simpler using regex:

var dateExample = '2nd August 9am - 27th September midnight';
var re = /January|February|March|April|May|June|July|August|September|October|November|December/gi;
var replaced = dateExample.replace(re, m => m.substring(0,3));
console.log(replaced)

You could use a similar trick for the times, the regex might be a bit more complex:

var dateExample = '2nd August 9am- 27th September midnight';
var datesRegex = /January|February|March|April|May|June|July|August|September|October|November|December/gi;


var timesRegex = /\w*([0-9]{1,2}(am|pm|AM|PM))|(noon|midnight)\w*/gi
var replaced = dateExample.replace(datesRegex, m => m.substring(0,3))
                           .replace(timesRegex,'');
console.log(replaced)

Putting it all together

function clean(input){

  var datesRegex = /January|February|March|April|May|June|July|August|September|October|November|December/gi;
  var timesRegex = /\w*([0-9]{1,2}(am|pm|AM|PM)\w*)|(noon|midnight)/gi
  return input.replace(datesRegex, m => m.substring(0,3))
                             .replace(timesRegex,'');
}

// test cases
console.log(clean("20th June 10am - 5th September 10pm"));
console.log(clean("2nd August 9am - 27th September midnight"));
console.log(clean("2nd August noon - 27th September midnight"));

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