rem: if(typeof (str)!="string"||str.length==0){ 
add: if(typeof (str)!="string"||str.length===0){ 
context: MochiKit.DateTime.isoTimestamp=function(str){str=str+"";if(typeof (str)!="string"||str.length==0){return null;}var res=str.match(MochiKit.DateTime._isoRegexp);if(typeof (res)=="undefined"||res==null){return null;}var year,month,day,hour,min,sec,msec;year=parseInt(res[1],10);if(typeof (res[2])=="undefined"||res[2]==""){return new Date(year);}month=parseInt(res[2],10)-1;day=parseInt(res[3],10);if(typeof (res[4])=="undefined"||res[4]==""){return new Date(year,month,day);}hour=parseInt(res[4],10);min=parseInt(res[5],10);sec=(typeof (res[6])!="undefined"&&res[6]!="")?parseInt(res[6],10):0;if(typeof (res[7])!="undefined"&&res[7]!=""){msec=Math.round(1000*parseFloat("0."+res[7]));}else{msec=0;}if((typeof (res[8])=="undefined"||res[8]=="")&&(typeof (res[9])=="undefined"||res[9]=="")){return new Date(year,month,day,hour,min,sec,msec);}var ofs;if(typeof (res[9])!="undefined"&&res[9]!=""){ofs=parseInt(res[10],10)*3600000;if(typeof (res[11])!="undefined"&&res[11]!=""){ofs+=parseInt(res[11],10)*60000;}if(res[9]=="-"){ofs=-ofs;}}else{ofs=0;}return new Date(Date.UTC(year,month,day,hour,min,sec,msec)-ofs);};
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