Bạn sinh vào thứ mấy?

[CPFounder]

Code:

<script language=Javascript>

<!--

function cala_day(form) {
       
        var nSwitch = 0
        var nMonth = parseInt(form.month.value)
        var nDay =  parseInt(form.day.value)
        var nYear =  parseInt(form.year.value)
       
        if(!(nYear % 4) && (nMonth > 2)) {
                nSwitch = 1
        }             

        var nDayOfWeek = cala_weekday(nMonth, nDay, nYear)
       
        if(nSwitch) {
                nDayOfWeek++
                nSwitch = 0
        }
       
        day_display(form, nDayOfWeek)
}

function cala_weekday( x_nMonth, x_nDay, x_nYear) {

        if(x_nMonth >= 3){     
                x_nMonth -= 2
        }
        else {
                x_nMonth += 10
        }

        if( (x_nMonth == 11) || (x_nMonth == 12) ){
                x_nYear--
        }

        var nCentNum = parseInt(x_nYear / 100)
        var nDYearNum = x_nYear % 100
       
        var nPart1 = parseInt(2.6 * x_nMonth - .2)
       
        var nZeller = (parseInt(nPart1 + x_nDay + nDYearNum + (nDYearNum / 4) + (nCentNum / 4) - 2 * nCentNum)) % 7
       
        if(nZeller < 0){
                nZeller += 7
        }
       
        return nZeller
}

function day_display(form, x_nDayOfWeek) {

        if(x_nDayOfWeek == 0) {
                form.birthday.value = "Saturday"
                return
        }
        if(x_nDayOfWeek == 1) {
                form.birthday.value = "Sunday"
                return
        }
        if(x_nDayOfWeek == 2) {
                form.birthday.value = "Monday"
                return
        }
        if(x_nDayOfWeek == 3) {
                form.birthday.value = "Tuesday"
                return
        }
        if(x_nDayOfWeek == 4) {
                form.birthday.value = "Wednesday"
                return
        }
        if(x_nDayOfWeek == 5) {
                form.birthday.value = "Thursday"
                return
        }
        if(x_nDayOfWeek == 6) {
                form.birthday.value = "Friday"
                return
        }

        form.birthday.value = "Not a valid date."
}
//-->

</script>

<TABLE border=0 cellPadding=5 cellSpacing=5 width="96%">
  <TBODY>
  <TR>
    <TD width="100%">

      <FORM>
      <DIV align=center>
      <CENTER>
      <TABLE align=center border=1 width=225>
        <TBODY>
        <TR>
          <TD align=middle bgColor=#0000ff colSpan=2 width=250><FONT
            color=#ffffff face=ARIEL,HELVETICA size=-1><B>Bạn sinh vào thứ
            mấy?</B></FONT><FONT face=ARIEL,HELVETICA size=-1></FONT></TD></TR>

        <TR>
          <TD bgColor=#ff0000 width=100><FONT size=2><B><FONT
            color=#ffff00>Tháng:</FONT></B><INPUT name=month
            size=4><BR><BR><B><FONT color=#ffff00>Ngày:</FONT></B><INPUT
            name=day size=4><BR><BR><B><FONT color=#ffff00>Năm:</FONT></B><INPUT
            name=year size=4></FONT> </TD>
          <TD align=middle bgColor=#ff0000 width=125><FONT
            color=#ffff00><BR><FONT size=2><B>Ví dụ:</B></FONT> <BR><FONT
            size=2><I><B>07-06-1986</B><BR><B>Sunday</B></I><BR><BR><B>Bạn sinh
            vào:</B></FONT> <BR><INPUT name=birthday size=10> </FONT></TD></TR>

        <TR>
          <TD align=middle bgColor=#0000ff colSpan=2><INPUT onclick=cala_day(this.form) type=button value=OK><INPUT type=reset value=Reset></FONT></TD></TR></TBODY></TABLE></CENTER></DIV></FORM></TD></TR></TBODY></TABLE><!--content stop-->

Demo : http://chinhphuc.info/Xem-tha-h11.htm