jQuery datetimepicker周起始日设置求助：如何将默认周日改为周一？

Hey there! I’ve dealt with this exact frustration before—sometimes the firstDay parameter doesn’t behave like you expect, and it usually comes down to which specific datetimepicker plugin you’re working with. Let’s walk through the two most common scenarios:

1. For jQuery UI Datepicker (or datetime extensions built on it) #

jQuery UI’s core Datepicker does use the firstDay parameter, where 0 equals Sunday and 1 equals Monday. If it wasn’t working for you, chances are your initialization code might have been missing something, or wasn’t running at the right time.

Here’s a working example to set Monday as the start day:

$(document).ready(function() {
  // Replace #your-datetime-input with your actual input ID
  $('#your-datetime-input').datepicker({
    firstDay: 1, // This forces Monday as the first day of the week
    dateFormat: 'yy-mm-dd', // Adjust your date format as needed
    timepicker: true // Include this if you're using a datetime extension
  });
});

Pro tip: Always wrap your datepicker initialization in $(document).ready() to ensure the input element exists before the script runs.

2. For the xdan/datetimepicker (popular standalone plugin) #

If you’re using the widely used standalone datetimepicker by xdan, the parameter name is different—it’s weekStart instead of firstDay. Setting this to 1 will make Monday the first day of the week.

Here’s how to implement it:

$(document).ready(function() {
  $('#your-datetime-input').datetimepicker({
    weekStart: 1, // Monday as the first day
    format: 'Y-m-d H:i:s', // Customize your datetime format here
    // Add any other options you need (like minDate, maxDate, etc.)
  });
});

Quick Troubleshooting Tips #

• Double-check your plugin: Look at the script tags in your HTML to confirm which datetimepicker library you’re loading. Mixing up parameters between plugins is the most common mistake here.
• Check for conflicts: If you have other jQuery plugins running, they might be overriding your datepicker settings. Try testing in a minimal environment to rule this out.
• Update the plugin: Outdated versions might have bugs with the week start parameter—upgrading to the latest stable version could fix it.

内容的提问来源于stack exchange，提问作者bluray