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index.html
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<html>
<head>
<title>Linear time calculator</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {
background: WHITE;
font-family: Verdana, Helvetica, Arial, sans-serif;
}
label {
font-weight:bold;
}
input {
font-size:1.1em;
width: 150px;
}
input#startDate, input#currentDate {
width: 250px;
}
.valid {
border: solid 2px green;
}
.invalid {
border: solid 2px red;
}
.info {
background:#EEF;
padding: 4px;
margin-top:0px;
}
#chart {
margin: 10%;
}
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/c3/0.7.20/c3.min.js" integrity="sha512-+IpCthlNahOuERYUSnKFjzjdKXIbJ/7Dd6xvUp+7bEw0Jp2dg6tluyxLs+zq9BMzZgrLv8886T4cBSqnKiVgUw==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.16.0/d3.min.js" integrity="sha512-FHsFVKQ/T1KWJDGSbrUhTJyS1ph3eRrxI228ND0EGaEp6v4a/vGwPWd3Dtd/+9cI7ccofZvl/wulICEurHN1pg==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/c3/0.7.20/c3.min.css" integrity="sha512-cznfNokevSG7QPA5dZepud8taylLdvgr0lDqw/FEZIhluFsSwyvS81CMnRdrNSKwbsmc43LtRd2/WMQV+Z85AQ==" crossorigin="anonymous" referrerpolicy="no-referrer" />
<script>
function recalculate() {
startDateElem = document.getElementById('startDate');
startValueElem = document.getElementById('startValue');
currentDateElem = document.getElementById('currentDate');
currentValueElem = document.getElementById('currentValue');
endValueElem = document.getElementById('endValue');
validateDateInput(startDateElem);
validateNumberInput(startValueElem);
validateDateInput(currentDateElem);
validateNumberInput(currentValueElem);
validateNumberInput(endValueElem);
timeDiff = 0;
var startDate = new Date(startDateElem.value);
var currentDate = new Date(currentDateElem.value);
if (startDate instanceof Date && !isNaN(startDate) && currentDate instanceof Date && !isNaN(currentDate)) {
timeDiff = currentDate - startDate;
if (timeDiff < 0) {
document.getElementById('runtime').innerText = "Start date is after the current date";
} else {
var msec = timeDiff;
var dy = Math.floor(msec / 1000 / 60 / 60 / 24);
msec -= dy * 1000 * 60 * 60 * 24;
var hh = Math.floor(msec / 1000 / 60 / 60);
msec -= hh * 1000 * 60 * 60;
var mm = Math.floor(msec / 1000 / 60);
msec -= mm * 1000 * 60;
var ss = Math.floor(msec / 1000);
msec -= ss * 1000;
document.getElementById('runtime').innerText = "Running so far for " + dy + " days, " + hh + " hours, " + mm + " minutes, " + ss + " seconds";
}
}
if (currentValueElem.value!="" && !isNaN(currentValueElem.value) && startValueElem.value!="" && !isNaN(startValueElem.value)) {
currentDiff = currentValueElem.value - startValueElem.value;
t = "";
if (currentDiff!=currentValueElem.value) t += "Progressed by " + currentDiff + "<br>";
if (timeDiff > 0) {
rate_per_millisecond = currentDiff / timeDiff;
rate_per_second = rate_per_millisecond * 1000;
rate_per_minute = rate_per_second * 60;
rate_per_hour = rate_per_minute * 60;
rate_per_day = rate_per_hour * 24;
t += "Progess rate:<br>";
t += significant_digits(rate_per_millisecond) + " per millisecond<br>";
t += significant_digits(rate_per_second) + " per second<br>";
t += significant_digits(rate_per_minute) + " per minute<br>";
t += significant_digits(rate_per_hour) + " per hour<br>";
t += significant_digits(rate_per_day) + " per day";
document.getElementById('rate').innerHTML = t;
if (endValueElem.value!="" && !isNaN(endValueElem.value)) {
totalDiff = endValueElem.value - startValueElem.value;
remainingDiff = endValueElem.value - currentValueElem.value;
t = "Value remaining " + remainingDiff + "<br>";
if (totalDiff!=endValueElem.value) t += "Total value diff " + totalDiff + "<br>";
var endDate = new Date(startDate.getTime() + Math.round(totalDiff / rate_per_millisecond))
t += "Estimated finish date time: " + endDate + "<br>";
t += significant_digits(currentDiff / totalDiff * 100) + "% complete<br><br>";
t += significant_digits(remainingDiff / rate_per_millisecond) + " milliseconds remaining<br>";
t += significant_digits(remainingDiff / rate_per_second) + " seconds remaining<br>";
t += significant_digits(remainingDiff / rate_per_minute) + " minutes remaining<br>";
t += significant_digits(remainingDiff / rate_per_hour) + " hours remaining<br>";
t += significant_digits(remainingDiff / rate_per_day) + " days remaining<br>";
document.getElementById('eta').innerHTML = t;
}
}
}
if (timeDiff > 0) {
var totalTimeDiff = timeDiff;
var headings = ['x', startDate, currentDate];
var values = ['value', startValueElem.value, currentValueElem.value];
if (endValueElem.value!="" && !isNaN(endValueElem.value)) {
headings.push(endDate);
values.push(endValueElem.value);
totalTimeDiff = endDate - startDate;
}
var labelFormat = '%Y-%m-%d %H:%M:%S';
if (totalTimeDiff < 1000 * 60 * 60 * 12) labelFormat = '%H:%M:%S';
var chart = c3.generate({
bindto: '#chart',
data: {
x: 'x',
columns: [
headings,
values
]
},
axis: {
x: {
type: 'timeseries',
tick: {
format: labelFormat,
rotate: 90
}
},
y: {
label: { text: 'Value', position: 'outer-middle' }
}
},
legend: { show: false }
});
}
}
function validateDateInput(elem) {
var d = new Date(elem.value);
if (d instanceof Date && !isNaN(d)) {
elem.className = "valid";
} else {
elem.className = "invalid";
}
}
function validateNumberInput(elem) {
if (elem.value!="" && !isNaN(elem.value)) {
elem.className = "valid";
} else {
elem.className = "invalid";
}
}
function significant_digits(flt) {
return flt<100 ? flt.toFixed(2) : flt.toFixed(0);
}
function init() {
document.getElementById('fields').addEventListener('change', function(event) { recalculate() });
document.getElementById('currentDate').value = new Date().toISOString();
recalculate();
}
</script>
</head>
<body onLoad="init();">
<h1>Linear time calculator</h1>
<div id="fields">
<p>
<label for="startDate">Start date time</label><br>
<input type="text" size="50" id="startDate"/>
</p>
<p>
<label for="startValue">Start value (typically zero)</label><br>
<input type="text" value="0" size="20" id="startValue"/>
</p>
<p>
<label for="currentDate">Current date time (or date time corresponding to the following value)</label><br>
<input type="text" size="50" id="currentDate" class="valid" />
</p>
<p id="runtime" class="info">
</p>
<p>
<label for="currentValue">Current value (e.g. count of processed records)</label><br>
<input type="text" size="20" id="currentValue"/>
</p>
<p id="rate" class="info">
</p>
<p>
<label for="endValue">End value (what are we counting up to?)</label><br>
<input type="text" size="20" id="endValue"/>
</p>
<p id="eta" class="info">
</p>
</div>
<div id="chart"></div>
<div id="aboutLinks">
<a href="https://harrywood.co.uk/blog/2020/09/04/linear-time-calculator/">about</a> |
<a href="https://github.com/harry-wood/linear-time-calculator">code on github</a>
</div>
</body>
</html>