alert('Please enter the date in dd/mm/yyyy format. Only dates between 1st January 1000 and 1st January 2100 are supported.'); alert('Please comment any discrepancy with the date in dd/mm/yyyy format and the expected result and the obtained result'); alert('Have Fun!'); function calculate() { if ((parseInt(document.getElementById('yob').value) >= 1000) && (parseInt(document.getElementById('yob').value) <= 2100) && (parseInt(document.getElementById('mob').value) <= 12) && (parseInt(document.getElementById('mob').value) >= 1) && (parseInt(document.getElementById('dob').value) >= 1) && (parseInt(document.getElementById('dob').value)<= 31)) { // year var yob = document.getElementById('yob').value; yob = parseInt(yob); var y = 0; if ((yob >= 1000) && (yob < 1100)) { y = 3; yob = yob - 1000; } else if ((yob >= 1100) && (yob < 1200)) { y = 1; yob = yob - 1100; } else if ((yob >= 1200) && (yob < 1300)) { y = 0; yob = yob - 1200; } else if ((yob >= 1300) && (yob < 1400)) { y = 5; yob = yob - 1300; } else if ((yob >= 1400) && (yob < 1500)) { y = 3; yob = yob - 1400; } else if ((yob >= 1500) && (yob < 1600)) { y = 1; yob = yob - 1500; } else if ((yob >= 1600) && (yob < 1700)) { y = 0; yob = yob - 1600; } else if ((yob >= 1700) && (yob < 1800)) { y = 5; yob = yob - 1700; } else if ((yob >= 1800) && (yob < 1900)) { y = 3; yob = yob - 1800; } else if ((yob >= 1900) && (yob < 2000)) { y = 1; yob = yob - 1900; } else if ((yob >= 2000) && (yob < 2100)) { y = 0; yob = yob - 2000; } if ([1,7,13,19,25,31,37,43,49,55,61,67,73,79,85,91,97].includes(yob)) { y += 0; } else if ([2,8,14,20,26,32,38,44,50,56,62,68,74,80,86,92,98].includes(yob)) { y += 1; } else if ([3,9,15,21,27,33,39,45,51,57,63,69,75,81,87,93,99].includes(yob)) { y += 2; } else if ([4,10,16,22,28,34,40,46,52,58,64,70,76,82,88,94].includes(yob)) { y += 3; } else if ([5,11,17,23,29,35,41,47,53,59,65,71,77,83,89,95].includes(yob)) { y += 5; } else if ([6,12,18,24,30,36,42,48,54,60,66,72,78,84,90,96].includes(yob)) { y += 6; } else { y = y; } //month var mob = document.getElementById('mob').value; mob = parseInt(mob); mob = mob - 1; var m = 0; switch (mob) { case 0: m = 0; break; case 1: m = 3; break; case 2: m = 3; break; case 3: m = 6; break; case 4: m = 1; break; case 5: m = 4; break; case 6: m = 6; break; case 7: m = 2; break; case 8: m = 5; break; case 9: m = 0; break; case 10: m = 3; break; case 11: m = 5; break; } var x = document.getElementById('yob').value; x = parseInt(x); if ([1000,1100,1300,1400,1500,1700,1800,1900].includes(x)) { m += 0; } else if ((x % 4 === 0) && (m > 0)) { m += 1; } //day var dob = document.getElementById('dob').value; dob = parseInt(dob); var d = dob % 7; //final var result = y + m + d; var fresult = result % 7; switch (fresult) { case 1: document.getElementById('result').innerHTML = 'Monday'; break; case 2: document.getElementById('result').innerHTML = 'Tuesday'; break; case 3: document.getElementById('result').innerHTML = 'Wednesday'; break; case 4: document.getElementById('result').innerHTML = 'Thursday'; break; case 5: document.getElementById('result').innerHTML = 'Friday'; break; case 6: document.getElementById('result').innerHTML = 'Saturday'; break; case 0: document.getElementById('result').innerHTML = 'Sunday'; break; } } else { alert("The date submitted is not between 1st January 1000 and 1st January 2100. Please enter a valid date."); document.getElementById('yob').value = ''; document.getElementById('mob').value = ''; document.getElementById('dob').value = ''; } }

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