Highstock - display number of week

Question

How can I show the week number for the date in Highstock (not Highcharts!)?

My SQL looks like this

select unix_timestamp(date)*1000 week         


        

Answer 1

To keep weeks and years consistent, I tend to use ISO-8601 standard when dealing with week numbering.

With Pawel answer and the js code from this blog, I set up the following solution.

Highcharts.dateFormats = {
        V: function (timestamp) {    
            var target  = new Date(timestamp);  
            var dayNr   = (target.getDay() + 6) % 7;  
            target.setDate(target.getDate() - dayNr + 3);  
            var firstThursday = target.valueOf();  
            target.setMonth(0, 1);  
            if (target.getDay() != 4) {  
                target.setMonth(0, 1 + ((4 - target.getDay()) + 7) % 7);  
            }  
            return 1 + Math.ceil((firstThursday - target) / 604800000); // 604800000 = 7 * 24 * 3600 * 1000  
        }  ,
        G: function(timestamp) {
            var target  = new Date(timestamp);  
            target.setDate(target.getDate() - ((target.getDay() + 6) % 7) + 3);  
            return target.getFullYear();  
        }
};

%V and %G respects the strftime format used in highstock.