Convert a timestamp to time since

timestamp_to_timesince.js

var timeStamp = msg.payload;
var date = timeStamp.substring(0, timeStamp.lastIndexOf("T") - 1);
var time = timeStamp.substring(timeStamp.lastIndexOf("T") + 1, timeStamp.lastIndexOf("+") - 1);

var bootDateTime = Date.parse(msg.payload);
var currentDateTime = Date.parse(new Date());

var difference = (currentDateTime - bootDateTime) / 1000;
var outputValue;

if (difference < 10)
    outputValue = "Just now"
else if (difference < 60)
    outputValue = Math.floor(difference) + " seconds";
else
{
    difference /= 60;
    if (difference < 60)
        if (Math.floor(difference) == 1)
            outputValue = "1 minute";
        else
            outputValue = Math.floor(difference) + " minutes";
    else
    {
        difference /= 60;
        if (difference < 24)
            if (Math.floor(difference) == 1)
                outputValue = "1 hour";
            else
                outputValue = Math.floor(difference) + " hours";
        else
        {
            difference /= 24;
            if (Math.floor(difference) == 1)
                outputValue = "1 day";
            else
                outputValue = Math.floor(difference) + " days";
        }
    }
}

return { payload : outputValue };