javascript - Moment.js diff of two moments defined by week and weekday gives wrong result -


i want calculate difference between moment (itemmoment) , (nowmoment) defined weekday, hour , minute. if itemmoment before nowmoment (diff < 0) want add 1 week , calculate difference again, addition of week (week: week + 1 in code )somehow doesn't change difference , still negative difference.

it's first time use moment.js library may don't how use correctly. great if experienced used help. 

var = moment();   var year = now.year();   var week = now.week();   var weekday = now.weekday();   var hour = now.hour();   var minute = now.minute();  var itemmoment = moment({                                 day: item.weekday,                                 hour: item.hour,                                 minute: item.minute                             });     var nowmoment = moment({                                 day: weekday,                                 hour: hour,                                 minute: minute                             });      if (itemmoment.diff(nowmoment) > 0) {         item.date = moment({                             year: year,                              week: week,                              weekday: item.weekday,                              hour: item.hour,                              minute: item.minute                         });         diff = itemmoment.diff(nowmoment);     }     else {         if (week == 51) {             week = -1;             year = year + 1         }         item.date = moment({                             year: year,                              week: week + 1,                              weekday: item.weekday,                              hour: item.hour,                              minute: item.minute                         });         diff = item.date.diff(now);

you can comparison using isbefore() or isafter(). http://momentjs.com/docs/#/query/ 

if (itemmoment.isbefore(nowmoment)) {

then can manipulation so: http://momentjs.com/docs/#/manipulating/

item.date = itemmoment.add('weeks', 1);

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