fix: replace .english.md extension with .md

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--- a/curriculum/challenges/english/10-coding-interview-prep/rosetta-code/date-manipulation.md
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+---
+title: Date manipulation
+id: 5966c21cf732a95f1b67dd28
+challengeType: 5
+forumTopicId: 302244
+---
+
+## Description
+<section id='description'>
+Given a date string in EST, output the given date as a string with 12 hours added to the time. Time zone should be preserved.
+Example input: <code>"March 6 2009 7:30pm EST"</code>
+Example output: <code>"March 7 2009 7:30am EST"</code>
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>add12Hours</code> should be a function.
+    testString: assert(typeof add12Hours === 'function');
+  - text: <code>add12Hours(dateString)</code> should return a string.
+    testString: assert(typeof add12Hours('January 17 2017 11:43am EST') === 'string');
+  - text: <code>add12Hours("January 17 2017 11:43am EST")</code> should return <code>"January 17 2017 11:43pm EST"</code>
+    testString: assert(add12Hours('January 17 2017 11:43am EST') === 'January 17 2017 11:43pm EST');
+  - text: Should handle day change. <code>add12Hours("March 6 2009 7:30pm EST")</code> should return <code>"March 7 2009 7:30am EST"</code>
+    testString: assert(add12Hours('March 6 2009 7:30pm EST') === 'March 7 2009 7:30am EST');
+  - text: Should handle month change in a leap years. <code>add12Hours("February 29 2004 9:15pm EST")</code> should return <code>"March 1 2004 9:15am EST"</code>
+    testString: assert(add12Hours('February 29 2004 9:15pm EST') === 'March 1 2004 9:15am EST');
+  - text: Should handle month change in a common years. <code>add12Hours("February 28 1999 3:15pm EST")</code> should return <code>"March 1 1999 3:15am EST"</code>
+    testString: assert(add12Hours('February 28 1999 3:15pm EST') === 'March 1 1999 3:15am EST');
+  - text: Should handle year change. <code>add12Hours("December 31 2020 1:45pm EST")</code> should return <code>"January 1 2021 1:45am EST"</code>
+    testString: assert(add12Hours('December 31 2020 1:45pm EST') === 'January 1 2021 1:45am EST');
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function add12Hours(dateString) {
+
+  return true;
+}
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+function add12Hours(dateString) {
+  const months = ['January', 'February', 'March', 'April', 'May', 'June',
+    'July', 'August', 'September', 'October', 'November', 'December'];
+  // Get the parts of the string
+  const parts = dateString.split(' ');
+  const month = months.indexOf(parts[0]);
+  const day = parseInt(parts[1], 10);
+  const year = parseInt(parts[2], 10);
+  const time = parts[3].split(':');
+  let hours = parseInt(time[0], 10);
+  if (time[1].slice(-2) === 'pm') {
+    hours += 12;
+  }
+  const minutes = parseInt(time[1].slice(0, -2), 10);
+
+  // Create a date with given parts, and updated hours
+  const date = new Date();
+  date.setFullYear(year, month, day);
+  date.setHours(hours + 12);  // Add 12 hours
+  date.setMinutes(minutes);
+
+  let hoursOutput = date.getHours();
+  let abbreviation = 'am';
+  if (hoursOutput > 12) {
+    hoursOutput -= 12;
+    abbreviation = 'pm';
+  }
+
+  return `${months[date.getMonth()]} ${date.getDate()} ${date.getFullYear()} ${hoursOutput}:${date.getMinutes()}${abbreviation} EST`;
+}
+
+```
+
+</section>