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127 lines
3.8 KiB
JavaScript
127 lines
3.8 KiB
JavaScript
/*
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DynAPI Distribution
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dynapi.functions.Date extension
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*/
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var f = dynapi.functions;
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f.Date = {}; // used by dynapi.library
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// Date Functions --------------------------------------
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f.dateAdd = function(interval,n,dt){
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if(!interval||!n||!dt) return;
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var s=1,m=1,h=1,dd=1,i=interval;
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if(i=='month'||i=='year'){
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dt=new Date(dt);
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if(i=='month') dt.setMonth(dt.getMonth()+n);
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if(i=='year') dt.setFullYear(dt.getFullYear()+n);
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}else if (i=='second'||i=='minute'||i=='hour'||i=='day'){
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dt=Date.parse(dt);
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if(isNaN(dt)) return;
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if(i=='second') s=n;
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if(i=='minute'){s=60;m=n}
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if(i=='hour'){s=60;m=60;h=n};
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if(i=='day'){s=60;m=60;h=24;dd=n};
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dt+=((((1000*s)*m)*h)*dd);
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dt=new Date(dt);
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}
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return dt;
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};
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f.dateDiff=function(interval,dt1,dt2){
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if(!interval||!dt1||!dt2) return;
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var v,s=1,m=1,h=1,dd=1,i=interval;
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if(i=='month'||i=='year'){
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dt1=new Date(dt1);
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dt2=new Date(dt2);
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years=dt2.getFullYear()-dt1.getFullYear();
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if (i=='year') v=years;
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else if(i=='month') {
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v=(dt2.getMonth()+1)-(dt1.getMonth()+1);
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if(years!=0) v+=(years*12);
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}
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}else if (i=='second'||i=='minute'||i=='hour'||i=='day'){
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dt1=Date.parse(dt1);
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dt2=Date.parse(dt2);
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if(isNaN(dt1)||isNaN(dt2)) return;
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v=dt2-dt1;
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if(i=='second') s=1000;
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if(i=='minute') s=60000;
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if(i=='hour'){s=60000;m=60};
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if(i=='day'){s=60000;m=60;h=24;};
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v=((((v/s)/m)/h)/dd);
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}
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return v;
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};
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f.formatDate = function(date,format){
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if(!date) return '';
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var dt=new Date(date);
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var mm=dt.getMonth();
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var dd=dt.getDate();
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var day=dt.getDay();
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var yyyy=dt.getFullYear();
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var hh=dt.getHours();
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var nn=dt.getMinutes();
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var ss=dt.getSeconds();
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var ampm;
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var days=['Sunday','Monday','Teusday','Wednesday','Thursday','Friday','Saturday'];
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var months=['January','February','March','April','May','June','July','August','September','October','November','December'];
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format=(format)? (format+'').toLowerCase():'dddd, mmmm dd, yyyy hh:nn:ss ampm';
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format=format.replace('mmmm',months[mm]);
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format=format.replace('mmm',months[mm].substr(0,3));
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format=format.replace('mm',mm+1);
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format=format.replace('dddd',days[day]);
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format=format.replace('ddd',days[day].substr(0,3));
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format=format.replace('dd',dd);
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format=format.replace('yyyy',yyyy);
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if(format.indexOf('ampm')>0){
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if(hh>12) hh=hh-12;
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if(hh<12) ampm='AM';
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else ampm='PM';
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format=format.replace('ampm',ampm);
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}
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format=format.replace('hh',hh);
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format=format.replace('nn',nn);
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format=format.replace('ss',ss);
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return format;
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};
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f.getDayOfYear = function(dt){
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dt = new Date(dt);
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if(isNaN(dt)) dt = new Date();
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var yr = new Date(dt.getFullYear(),0,1);
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yr = yr.getTime() - (yr.getDay()-1)*(24*60*60*1000);
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return(Math.ceil((dt.getTime() - yr)/(24*60*60*1000)));
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};
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f.isDate = function(dt,format){
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if (!dt) return false;
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var dd,mm,yyyy;
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var isLeapYear,st=true,delim='/';
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dt+='';format=(format)? format+'':'';
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if(dt.indexOf('/')>=0) delim='/';
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else if(dt.indexOf('-')>=0) delim='-';
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else if(dt.indexOf(' ')>=0) delim=' ';
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dt=dt.split(delim);
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if(format) format=format.replace(/\W/g,'/');
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else {
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if (dt[0]>=1000) format='yyyy/mm/dd';
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else if (dt[0]>=12 && dt[1]<=12) format='dd/mm/yyyy';
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else if (dt[0]<=12 && dt[1]>=12) format='mm/dd/yyyy';
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};
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if(format=='yyyy/mm/dd'){yyyy=dt[0];mm=dt[1];dd=dt[2];}
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else if(format=='mm/dd/yyyy'){mm=dt[0];dd=dt[1];yyyy=dt[2];}
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else if(format=='dd/mm/yyyy'){dd=dt[0];mm=dt[1];yyyy=dt[2];}
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if(isNaN(dd)||isNaN(mm)||isNaN(yyyy)) st=false;
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else if(dd<1 || dd>31) st=false;
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else if(yyyy>9999) st=false;
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else if (mm < 1 || mm > 12) st=false;
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else if((mm==4 || mm==6 || mm==9 || mm==11) && dd==31) st=false;
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else if(mm==2) { // check for leap year and february 29th
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isLeapYear = (yyyy % 4 == 0 && (yyyy % 100 != 0 || yyyy % 400 == 0));
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if (dd > 29 || (dd==29 && !isLeapYear)) st=false;
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}
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return st;
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};
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