In this blog we will learn to convert the time format as per requirement with the help of the regular expression.
Pattern of regular expression for time in 24-hour format:
1. Pattern 1: ( [01]?[0-9]|2[0-3] ) : [0-5][0-9]
Explanation:
|
( // beginning of the group
[01]?[0-9] // date may start with 0-9, 1-9, 00-09, 10-19
| // or
2[0-3] // date may range between 20-23
) // close of group
: // followed by a semi colon
[0-5][0-9] // further followed by 0..5 and 0..9, i.e, 00 to 59
|
2. Pattern 2: (/^([01]\d|2[0-3])(:)([0-5]\d)(:[0-5]\d)?$/)
above mentioned patterns fulfills the following requirements:
- Time is always expressed in 24 hour and of HH:MM format
- String must have at least one timerange or many which should be separated by comma
- Any spaces between the time elements should be tolerated by the matching pattern.
- String validated must match completely.
Following is the sample code to convert the format:
function tConvert (time) {
// Check correct time format and split into components
time = time.toString ().match (/^([01]\d|2[0-3])(:)([0-5]\d)(:[0-5]\d)?$/) || [time];
if (time.length > 1) { // If time format correct
time = time.slice (1); // Remove full string match value
time[5] = +time[0] < 12 ? 'AM' : 'PM'; // Set AM/PM
time[0] = +time[0] % 12 || 12; // Adjust hours
}
return time.join (''); // return adjusted time or original string
}
Hope you find this blog useful!
Happy Coding :)
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