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california-clock-change.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>California Clock Change - PST/PDT Only</title>
<style>
body {
font-family: system-ui, -apple-system, sans-serif;
margin: 0;
padding: 20px;
background-color: #f0f4f8;
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
}
.container {
background: white;
padding: 2rem;
border-radius: 12px;
box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
max-width: 600px;
width: 90%;
text-align: center;
}
h1 {
color: #1a365d;
font-size: 1.8rem;
margin-bottom: 0.5rem;
}
.subtitle {
color: #4a5568;
margin-bottom: 1.5rem;
}
.info-box {
background: #e6fffa;
border: 2px solid #38b2ac;
border-radius: 8px;
padding: 1.5rem;
margin: 1rem 0;
font-size: 1.2rem;
line-height: 1.6;
}
.highlight {
color: #2b6cb0;
font-weight: bold;
}
.tonight {
display: inline-block;
background: #f6e05e;
color: #744210;
padding: 0.2em 0.5em;
border-radius: 4px;
margin-left: 0.5em;
font-weight: bold;
}
.wrong-timezone {
background: #fed7d7;
border: 2px solid #f56565;
border-radius: 8px;
padding: 1.5rem;
margin: 1rem 0;
font-size: 1.2rem;
line-height: 1.6;
color: #c53030;
}
.body-clock {
background: #ebf8ff;
border: 2px solid #4299e1;
border-radius: 8px;
padding: 1.5rem;
margin: 1rem 0;
font-size: 1.2rem;
line-height: 1.6;
}
.past-change {
background: #faf5ff;
border: 2px solid #805ad5;
border-radius: 8px;
padding: 1.5rem;
margin: 1rem 0;
font-size: 1.2rem;
line-height: 1.6;
}
@media (max-width: 480px) {
.container {
padding: 1.5rem;
}
h1 {
font-size: 1.5rem;
}
.info-box, .body-clock, .past-change {
font-size: 1.1rem;
padding: 1rem;
}
}
</style>
</head>
<body>
<div class="container">
<h1>California Clock Change</h1>
<div class="subtitle">For Pacific Time (PST/PDT) only</div>
<div id="past-change"></div>
<div id="future-change"></div>
<div id="body-clock"></div>
<div id="current-dst"></div>
</div>
<script>
function isCaliforniaTimezone() {
const timezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
return timezone === "America/Los_Angeles" ||
timezone === "America/Pacific" ||
timezone === "US/Pacific" ||
timezone === "PST8PDT";
}
function getClockChanges() {
const now = new Date();
const year = now.getFullYear();
// Get changes for current and adjacent years to handle year boundaries
function getYearChanges(y) {
// Second Sunday in March
const springForward = new Date(y, 2, 1 + (14 - new Date(y, 2, 1).getDay()));
// First Sunday in November
const fallBack = new Date(y, 10, 1 + (7 - new Date(y, 10, 1).getDay()));
return [
{ date: springForward, isSpringForward: true },
{ date: fallBack, isSpringForward: false }
];
}
const changes = [
...getYearChanges(year - 1),
...getYearChanges(year),
...getYearChanges(year + 1)
].sort((a, b) => a.date - b.date);
// Find the most recent past change and next future change
const pastChange = changes.filter(change => change.date < now).pop();
const futureChange = changes.find(change => change.date > now);
return { pastChange, futureChange };
}
function formatDate(date) {
const months = ['January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October', 'November', 'December'];
return `${months[date.getMonth()]} ${date.getDate()}, ${date.getFullYear()}`;
}
function formatTime(date) {
return date.toLocaleTimeString('en-US', {
hour: 'numeric',
minute: '2-digit',
hour12: true
});
}
function getDaysSince(date) {
const now = new Date();
const diffTime = Math.abs(now - date);
return Math.floor(diffTime / (1000 * 60 * 60 * 24));
}
function updateBodyClockInfo(pastChange) {
const bodyClockDiv = document.getElementById('body-clock');
const daysSince = getDaysSince(pastChange.date);
if (daysSince <= 7) { // Show message for a week after the change
const now = new Date();
const dogClock = new Date(now);
if (pastChange.isSpringForward) {
dogClock.setHours(now.getHours() - 1);
} else {
dogClock.setHours(now.getHours() + 1);
}
bodyClockDiv.className = 'body-clock';
bodyClockDiv.innerHTML = `
<p>🐺 Is your dog confused about meal or walk times?</p>
<p>While your clock says it's <span class="highlight">${formatTime(now)}</span>,
your dog's internal clock thinks it's <span class="highlight">${formatTime(dogClock)}</span>!</p>
<p>Dogs have very reliable internal clocks and don't automatically adjust to Daylight Saving Time.
Don't worry - your pup's schedule should adjust naturally over the next few days.</p>
`;
} else {
bodyClockDiv.innerHTML = '';
}
}
function updateInfo() {
if (!isCaliforniaTimezone()) {
document.getElementById('future-change').className = 'wrong-timezone';
document.getElementById('future-change').innerHTML = 'You appear to be outside of California/Pacific Time.<br>This tool only works for Pacific Time (PST/PDT).';
return;
}
const { pastChange, futureChange } = getClockChanges();
// Show past change
const pastChangeDiv = document.getElementById('past-change');
const pastSaturday = new Date(pastChange.date);
pastSaturday.setDate(pastChange.date.getDate() - 1);
pastChangeDiv.className = 'past-change';
pastChangeDiv.innerHTML = `
<div>Most recent change:</div>
On <span class="highlight">Sunday, ${formatDate(pastChange.date)}</span>,
clocks ${pastChange.isSpringForward ? 'sprang forward' : 'fell back'}
(you ${pastChange.isSpringForward ? 'lost' : 'gained'} one hour of sleep).
`;
// Show future change
const futureChangeDiv = document.getElementById('future-change');
const futureSaturday = new Date(futureChange.date);
futureSaturday.setDate(futureChange.date.getDate() - 1);
const now = new Date();
const isTonight = now.getDate() === futureSaturday.getDate() &&
now.getMonth() === futureSaturday.getMonth() &&
now.getFullYear() === futureSaturday.getFullYear();
const sleepEffect = futureChange.isSpringForward ? 'lose an hour of sleep' : 'get an extra hour of sleep';
const clockEffect = futureChange.isSpringForward ?
'clocks spring forward from 2:00 AM to 3:00 AM' :
'clocks fall back from 2:00 AM to 1:00 AM';
const tonightBadge = isTonight ? '<span class="tonight">That\'s tonight!</span>' : '';
futureChangeDiv.className = 'info-box';
futureChangeDiv.innerHTML = `
<div>Next change:</div>
When you go to bed on <span class="highlight">Saturday, ${formatDate(futureSaturday)}</span>${tonightBadge},
you will ${sleepEffect}!<br><br>
The ${clockEffect} on
<span class="highlight">Sunday, ${formatDate(futureChange.date)}</span>.
`;
// Update body clock info based on past change
updateBodyClockInfo(pastChange);
// Determine if it is currently daylight savings time or not
const currentDstDiv = document.getElementById('current-dst');
const isDst = pastChange.isSpringForward && !futureChange.isSpringForward;
currentDstDiv.className = 'info-box';
currentDstDiv.innerHTML = `
<div>Current status:</div>
It is currently <span class="highlight">${isDst ? 'Daylight Saving Time (PDT)' : 'Standard Time (PST)'}</span>.
`;
}
updateInfo();
// Update the times every minute
setInterval(updateInfo, 60000);
</script>
</body>
</html>