javascript - Scripts that get weeknumber, but changes to the next week every friday -

i have screen running , showing jobs of current week. use script calculate current week:

date.prototype.getweek = function() {     var onejan = new date(this.getfullyear(),0,1);     return math.ceil((((this - onejan) / 86400000) + onejan.getday()+1)/7); }  

but show next week every friday. there easy way change current script changes on friday instead? maybe way change @ 10 (my timezone - cest)

all hints , pointers appreciated :)

if understood correctly can increment reutrned value if today friday.

date.prototype.getweek = function() {     var onejan = new date(this.getfullyear(),0,1);             var weeknr = math.ceil((((this - onejan) / 86400000) + onejan.getday()+1)/7);     return this.getday() == 5 ? weeknr + 1 : weeknr; } 

keep in mind getday() returns day of week (from 0 6) specified date. sunday 0, monday 1 , friday 5. can more details here.