1970/1/1 이후 현재까지

일자와 시간을 반복해서 계산할 때는 밀리초값에 해당하는 변수를 일, 시, 분으로 정의하는 것이 편리하다.

<SCRIPT>
var br='<BR>'; // 줄바꿈
var xSec=1000;
var xMin=xSec*60;
var xHour=xMin*60;
var xDate=xHour*24;
var xMonth=xDate*365.25/12;
var xYear=xMonth*12;
var str=''; // 출력 문자열 변수 선언
var ss1=' 지났다.';
str+='1분은'+xMin+' 밀리초'+br;
str+='1시간은'+xHour+' 밀리초'+br;
str+='1일은'+xDate+' 밀리초'+br;
str+='1월은'+xMonth+' 밀리초'+br;
str+='1년은'+xYear+' 밀리초'+br;

var now=new Date(); // 현재 시간을 변수에 할당
var time=now.getTime();
str='<FONT color=green>약(반올림하여)</FONT>'+br+'time='+time+' 밀리초'+ss1+br;
str+='Math.round(time/xSec)='+Math.round(time/xSec)+' 초'+ss1+br;
str+='Math.round(time/xMin)='+Math.round(time/xMin)+' 분'+ss1+br;
str+='Math.round(time/xHour)='+Math.round(time/xHour)+' 시간'+ss1+br;
str+='Math.round(time/xDate)='+Math.round(time/xDate)+' 일'+ss1+br;
str+='Math.round(time/xMonth)='+Math.round(time/xMonth)+' 개월'+ss1+br;
str+='Math.round(time/xYear)='+Math.round(time/xYear)+' 년'+ss1+br;
document.write(str); // 결과 문자열 출력
</SCRIPT>

일자와 시간을 반복해서 계산할 때는 밀리초값에 해당하는 변수를 일, 시, 분으로 정의하는 것이 편리하다.

<SCRIPT>
var br='<BR>'; // 줄바꿈
var str=''; // 출력 문자열 변수 선언
var int=gap=0;
var xSec=1000;
var xMin=1000*60;
var xHour=xMin*60;
var xDate=xHour*24;
var xMonth=xDate*365.25/12;
var xYear=xMonth*12;

var now=new Date();
var time=now.getTime();
str+='now.getTime()='+time+br;

var year=2005;
var month=12;
var date=25;
var newTime=Date.UTC(year,month-1,date,0,0,0);
str+='time=Date.UTC(year,(month-1),date,0,0,0)=Date.UTC('+year+','+(month-1)+','+date+',0,0,0)='
  +Date.UTC(year,(month-1),date,0,0,0)+br;

gap=time-newTime;
str+='gap=time-newTime='+gap+'ms'+br;

if (time>newTime) s1=' '
else s1='과거 ';
str+=s1+'<blockquote>';
str+=gap+' ms'+br;
str+='약 '+Math.round(gap/xSec)+'초'+br;
str+='약 '+Math.round(gap/xMin)+'분'+br;
str+='약 '+Math.round(gap/xHour)+'시간'+br;
str+='약 '+Math.round(gap/xDate)+'일'+br;
str+='약 '+Math.round(gap/xMonth)+'월'+br;
str+='약 '+Math.round(gap/xYear)+'년'+br;
str+='</blockquote>';

str+='UTC '+year+'년 '+month+'월 '+date+'일 자정부터'+br;
str+='현재('+now.getYear()+'년 '+(now.getMonth()+1)+'월 '+now.getDate()+'일)까지는'+br;
divide(gap,xYear);
ss='정확히 '+s1+int+'년 ';
divide(gap,xMonth);
ss+=int+'개월 ';
divide(gap,xDate);
ss+=int+'일 ';
divide(gap,xHour);
ss+=int+'시간 ';
divide(gap,xMin);
ss+=int+'분 ';
divide(gap,xSec);
ss+=int+'초 '+gap+'ms';
str+=ss;
document.write(str);

document.write(str); // 결과 문자열 출력

function divide(numb,div){
  int=Math.floor(numb/div);
  rest=gap-int;
  gap-=int*div;
  return (int,gap)
}
</SCRIPT>

<DIV class=show id=clacShow title="결과"></DIV>
<DIV class=show style=text-align:center>
<FORM name=clacForm>
<INPUT type=text name=fromYear size=4>년
<INPUT type=text name=fromMonth size=2>월
<INPUT type=text name=fromDate size=2>일
<INPUT type=text name=fromHour size=2>시
<INPUT type=text name=fromMin size=2>분
<INPUT type=text name=fromSec size=2>초부터<BR>
<INPUT type=text name=toYear size=4>년
<INPUT type=text name=toMonth size=2>월
<INPUT type=text name=toDate size=2>일
<INPUT type=text name=toHour size=2>시
<INPUT type=text name=toMin size=2>분
<INPUT type=text name=toSec size=2>초까지<BR>
<INPUT type=button onClick=CalcTime() value="계산">
<INPUT type=button onClick=ResetTime() value="다시">
</FORM></DIV>

<SCRIPT>
var now,str='',br='<BR>';
formObj=document.clacForm;
ResetTime()

function CalcTime(){
  str='';
  str+='현재 싯점='+now.getTime()+br
  fromTime=toTime=now;
  fromTime.setFullYear(formObj.fromYear.value)
  fromTime.setMonth(formObj.fromMonth.value-1)
  fromTime.setDate(formObj.fromDate.value)
  fromTime.setHours(formObj.fromHour.value)
  fromTime.setMinutes(formObj.fromMin.value)
  fromTime.setSeconds(formObj.fromSec.value)
  fromValue=fromTime.getTime();
  str+='시작 싯점='+fromValue+br;

  toTime.setFullYear(formObj.toYear.value)
  toTime.setMonth(formObj.toMonth.value-1)
  toTime.setDate(formObj.toDate.value)
  toTime.setHours(formObj.toHour.value)
  toTime.setMinutes(formObj.toMin.value)
  toTime.setSeconds(formObj.toSec.value)
  toValue=toTime.getTime();
  time=toValue-fromValue
  str+='종료 싯점='+toValue+br;

  str+='차이는 ='+time+' 밀리초'+br

  var xSec=1000;
  var xMin=xSec*60;
  var xHour=xMin*60;
  var xDate=xHour*24;
  var xMonth=xDate*365.25/12;
  var xYear=xMonth*12;

  var ss1='지났다.';
  if(time<0) ss1='이전이다.';
  with (Math){
    str+=' '+abs(round(time/xYear))+' 년 ';
    time-=round(time/xYear)*xYear;
    str+=abs(round(time/xMonth))+' 개월 ';
    time-=round(time/xMonth)*xMonth;
    str+=abs(round(time/xDate))+' 일';
    time-=round(time/xDate)*xDate;
    str+=abs(round(time/xHour))+' 시간 ';
    time-=round(time/xMin)*xMin;
    str+=abs(round(time/xMin))+' 분 ';
    str+=abs(round(time/xSec))+' 초 '+ss1+br;
  }
  clacShow.innerHTML=str;

}
function ResetTime(){
  now=new Date();
  formObj.fromYear.value=formObj.toYear.value=now.getFullYear();
  formObj.fromMonth.value=formObj.toMonth.value=now.getMonth()+1;
  formObj.fromDate.value=formObj.toDate.value=now.getDate();
  formObj.fromHour.value=formObj.toHour.value=now.getHours();
  formObj.fromMin.value=formObj.toMin.value=now.getMinutes();
  formObj.fromSec.value=formObj.toSec.value=now.getSeconds();
  clacShow.innerHTML='';
}
</SCRIPT>

<SCRIPT>
var br='<BR>'; // 줄바꿈
var str=''; // 출력 문자열 변수 선언
var now=new Date(); // 현재 시간을 변수에 할당
numb=Date.parse(now); // 현재 밀리초
days=100; // 일자 지정 변수 선언
str+='now.toLocaleString()='+now.toLocaleString()+br; // 현재 시간 출력
str+='numb=Date.parse(now)='+Date.parse(now)+br; // 현재 시간 밀리초 출력
str+='days=100; // 100일후 설명 출력
now.setTime(numb+(days*1000*60*60*24)); // 새로운 밀리초 계산해서 할당
str+='now.setTime(numb+(days*1000*60*60*24))'+br; // 새로운 밀리초 계산해서 할당 설명
str+='now.toLocaleString()='+now.toLocaleString()+br; // 계산된 일자 출력, 100일후
document.write(str); // 결과 문자열 출력
</SCRIPT>

<DIV class=show id=showGap title="결과"></DIV>
<DIV class=show>
<FORM name=formGap>
<INPUT type=text name=gfYear size=4>년
<INPUT type=text name=gfMonth size=2>월
<INPUT type=text name=gfDate size=2>일
<INPUT type=text name=gfHour size=2>시
<INPUT type=text name=gfMin size=2>분
<INPUT type=text name=gfSec size=2>초부터<BR>

<INPUT type=text name=gapYear size=4 value=0>년
<INPUT type=text name=gapMonth size=2 value=0>월
<INPUT type=text name=gapDate size=2 value=0>일
<INPUT type=text name=gapHour size=2 value=0>시
<INPUT type=text name=gapMin size=2 value=0>분
<INPUT type=text name=gapSec size=2 value=0>초
<SELECT name=gapSel><OPTION value=before>이전<OPTION value=after selected>이후</SELECT><BR>
<INPUT type=button onClick=CalcGap() value="계산">
<INPUT type=button onClick=ResetGap() value="다시">
</FORM>
</DIV>

<SCRIPT>
var br='<BR>'; // 줄바꿈
  var xSec=1000;
  var xMin=xSec*60;
  var xHour=xMin*60;
  var xDate=xHour*24;
  var xMonth=xDate*365.25/12;
  var xYear=xMonth*12;
gapObj=document.formGap;
ResetGap()

function CalcGap(){
  str=''; // 출력 문자열 변수 선언
  now=new Date();
  if (gapObj.gapSel[0].selected){
    now.setFullYear(gapObj.gfYear.value-gapObj.gapYear.value)
    now.setMonth((gapObj.gfMonth.value-1)-gapObj.gapMonth.value)
    now.setDate(gapObj.gfDate.value-gapObj.gapDate.value)
    now.setHours(gapObj.gfHour.value-gapObj.gapHour.value)
    now.setMinutes(gapObj.gfMin.value-gapObj.gapMin.value)
    now.setSeconds(gapObj.gfSec.value-gapObj.gapSec.value)
  } else {
    now.setFullYear(Number(gapObj.gfYear.value)+Number(gapObj.gapYear.value))
    now.setMonth(Number(gapObj.gfMonth.value-1)+Number(gapObj.gapMonth.value))
    now.setDate(Number(gapObj.gfDate.value)+Number(gapObj.gapDate.value))
    now.setHours(Number(gapObj.gfHour.value)+Number(gapObj.gapHour.value))
    now.setMinutes(Number(gapObj.gfMin.value)+Number(gapObj.gapMin.value))
    now.setSeconds(gapObj.gfSec.value+gapObj.gapSec.value)
  }
  str+=now.toLocaleString();
  showGap.innerHTML=str;
}

function ResetGap(){
  now=new Date();
  gapObj.gfYear.value=now.getFullYear();
  gapObj.gfMonth.value=now.getMonth()+1;
  gapObj.gfDate.value=now.getDate();
  gapObj.gfHour.value=now.getHours();
  gapObj.gfMin.value=now.getMinutes();
  gapObj.gfSec.value=now.getSeconds();
  gapObj.gapYear.value=gapObj.gapMonth.value=gapObj.gapDate.value=
    gapObj.gapHour.value=gapObj.gapMin.value=gapObj.gapSec.value=0;
  showGap.innerHTML='';
}
</SCRIPT>