CODEWITHSUNDEEP
javascriptregexdatetimesubstring
Marco
Marco

Reputation: 61

convert a string (HH:mm) into date and print custom formatting (arrives in x minutes)

i have this javascript:

var data = '<Message>Fermata 1494 -  Linea R2 -> 14:01  Linea 202 -> 14:06   </Message>';
var arr = data.match(/[\w\d]+\s*->\s*[\d:]+/g);
alert(arr);
for(var i=0; i < arr.length; i++) { 
arr[i] = arr[i].replace('->', 'at');
arr[i] = arr[i]+'\n';
}
arr = arr.join('');
console.log(arr);

it fetches a formatted page and prints this information:

R2 at 14:01 202 at 14:06

jsfiddle: JsFiddle

i need to print in

R2 at 14:01 - arrives in x minutes format...

so i need to convert "14:01" part of the string in current timestamp and then do a substraction but seems tha i cant do it, in pure javascript, no jquery.

Upvotes: 1

Views: 824

Answers (2)

Robby Cornelissen
Robby Cornelissen

Reputation: 97150

Should be close to this. Little bit tricky, because I don't know how it rolls over on midnight.

function handleMessage(message) {
    var now = new Date();
    var list = message.match(/[\w\d]+\s*->\s*[\d:]+/g);
    var result = list.map(function(entry) {
        return handleEntry(entry, now);
    }).join("\n");

    alert(result);
}

function handleEntry(entry, now) {
    var parts = entry.split(" -> ");
    var line = parts[0];
    var time = parts[1];

    var minutesToGo = getMinutesToGo(time, now);

    return ("Line " + line + " arrives in " + minutesToGo + " minutes");
}

function getMinutesToGo(time, now) {
    var parts = time.split(":");
    var timeMinutes = (parseInt(parts[0]) * 60) + parseInt(parts[1]);
    var nowMinutes = (now.getHours() * 60) + now.getMinutes();
    var oneDayMinutes = 24 * 60;

    return (oneDayMinutes + timeMinutes - nowMinutes) % oneDayMinutes;
}

var message = '<Message>Fermata 1494 -  Linea R2 -> 14:01  Linea 202 -> 14:06   </Message>';

handleMessage(message);

Upvotes: 1

Danyu
Danyu

Reputation: 507

Assume the date is today, you can construct the date string like this:

var today =new Date();
var dateStr=today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate()
            +" 14:01"+ ":00"; // attach hh:mm

Upvotes: 0

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