Calculate exactly when your 60/70-hour clock restarts.
Earliest Return to Duty:
How the 34-Hour Reset Works
In the trucking industry, the Federal Motor Carrier Safety Administration (FMCSA) enforces Hours of Service (HOS) regulations. The 34-hour reset is an optional provision that allows drivers to "restart" their 60-hour or 70-hour weekly limit. By taking at least 34 consecutive hours off-duty or in a sleeper berth, a driver's cumulative work week clock is reset to zero.
This calculator helps professional drivers and fleet managers determine the precise moment a driver can legally get back behind the wheel after a long haul.
Example Calculation:
If a driver completes their last shift and goes off-duty on Friday at 6:00 PM, they must remain off-duty for a full 34 hours.
The driver is eligible to return to duty on Sunday at 4:00 AM.
Current FMCSA Reset Rules (2024)
Consecutive Hours: The 34 hours must be consecutive. Any interruption—such as moving the truck or performing yard moves—will break the reset.
Status: You can be "Off-Duty," in the "Sleeper Berth," or a combination of both.
Frequency: Currently, there is no limit on how many times you can use the 34-hour reset per week (the old "once every 168 hours" rule was repealed).
Logging: Ensure your ELD (Electronic Logging Device) matches your calculated restart time to avoid violations during DOT inspections.
Common Questions
Does a reset clear my 11-hour driving limit?
No, the 34-hour reset is specifically for the 60/70-hour multi-day limit. Your daily 11-hour driving and 14-hour duty limits are reset by a standard 10-hour off-duty period.
What if I log 33 hours and 59 minutes?
Under FMCSA rules, 33 hours and 59 minutes is not a reset. You must reach the full 34-hour mark before performing any on-duty tasks. Always give yourself a small buffer of a few minutes to ensure compliance.
function calculateReset() {
var dateVal = document.getElementById('offDutyDate').value;
var timeVal = document.getElementById('offDutyTime').value;
var resultDiv = document.getElementById('hosResult');
var display = document.getElementById('readyTimeDisplay');
var remainingDisplay = document.getElementById('timeRemaining');
if (!dateVal || !timeVal) {
alert("Please select both the date and time you went off-duty.");
return;
}
// Create date object from inputs
var offDutyStart = new Date(dateVal + 'T' + timeVal);
if (isNaN(offDutyStart.getTime())) {
alert("Invalid date or time format.");
return;
}
// Add 34 hours (34 * 60 * 60 * 1000 milliseconds)
var resetCompletion = new Date(offDutyStart.getTime() + (34 * 60 * 60 * 1000));
// Format the output
var options = {
weekday: 'long',
year: 'numeric',
month: 'long',
day: 'numeric',
hour: '2-digit',
minute: '2-digit'
};
var formattedResult = resetCompletion.toLocaleString(undefined, options);
// Show result
resultDiv.style.display = 'block';
display.innerHTML = formattedResult;
// Calculate time relative to "now"
var now = new Date();
if (resetCompletion > now) {
var diffMs = resetCompletion – now;
var diffHrs = Math.floor(diffMs / (1000 * 60 * 60));
var diffMins = Math.round((diffMs % (1000 * 60 * 60)) / (1000 * 60));
remainingDisplay.innerHTML = "You will be ready in approximately " + diffHrs + " hours and " + diffMins + " minutes.";
remainingDisplay.style.color = "#d32f2f";
} else {
remainingDisplay.innerHTML = "Your 34-hour reset is already complete. You are eligible to return to duty.";
remainingDisplay.style.color = "#2e7d32";
}
// Smooth scroll to result
resultDiv.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}
// Set default date to today for convenience
window.onload = function() {
var today = new Date();
var dd = String(today.getDate()).padStart(2, '0');
var mm = String(today.getMonth() + 1).padStart(2, '0');
var yyyy = today.getFullYear();
document.getElementById('offDutyDate').value = yyyy + '-' + mm + '-' + dd;
};