JavaScript: Check whether a given value is time string or not

JavaScript validation with regular expression: Exercise-11 with Solution

Validate Time String

Write a JavaScript function to check whether a given value is a time string or not.

Visual Presentation:

Sample Solution:

JavaScript Code:

function is_timeString(str)
{
 regexp = /^(2[0-3]|[01]?[0-9]):([0-5]?[0-9]):([0-5]?[0-9])$/;
  
        if (regexp.test(str))
          {
            return true;
          }
        else
          {
            return false;
          }
}

console.log(is_timeString("11:35:30"));

console.log(is_timeString("90:90:90"));

Output:

true
false

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-11 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that uses a regular expression to verify if a string represents a valid time in HH:MM:SS format.
• Write a JavaScript function that accepts a time string and checks for valid hour, minute, and second ranges.
• Write a JavaScript function that converts a 12-hour time string with AM/PM into a 24-hour format and validates it.
• Write a JavaScript function that tests multiple time string formats and returns a boolean indicating validity.

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