JS: Sharepoint helpers

sharepoint_utils.js

//	++ Create Date from SP time string
//----------------------------------------------
function realDate(spString) {
    //"yyyy-mm-ddThh:mm:ss-08:00"
    var dateArr = spString.split(/\D/),
        date = new Date();

    date.setFullYear(parseInt(dateArr[0], 10), ((parseInt(dateArr[1], 10) - 1) % 12), parseInt(dateArr[2], 10));
    date.setUTCHours(parseInt(dateArr[3], 10), parseInt(dateArr[4], 10), parseInt(dateArr[5], 10));

    return date;
}

//	++ Transform SP time string into "time since"
//----------------------------------------------
function timeSince(spString) {
    //"yyyy-mm-ddThh:mm:ss-08:00"
    var dateArr = spString.split(/\D/),
        date = new Date(),
        units = ['year', 'month', 'week', 'day', 'hour', 'minute', 'second'],
        length = [31536000, 2592000, 604800, 86400, 3600, 60, 1],
        seconds, interval, test, i = 5;

    date.setFullYear(parseInt(dateArr[0], 10), ((parseInt(dateArr[1], 10) - 1) % 12), parseInt(dateArr[2], 10));
    date.setUTCHours(parseInt(dateArr[3], 10), parseInt(dateArr[4], 10), parseInt(dateArr[5], 10));
    seconds = Math.floor((new Date() - date) / 1000);
    test = seconds;

    do {
        interval = test;
        if (test = Math.floor(seconds / length[i])) {
            i--;
        }
    } while (test && i)
    return interval === 1 ? interval + " " + units[i + 1] + " ago" : interval + " " + units[i + 1] + "s ago";
}