Fix 12-hour time format issue in graphs by implementing custom 24-hour formatter

[Copilot]

This PR fixes the confusing time display issue in graphs where minutes were shown in 12-hour format without AM/PM indicators, while hours were correctly displayed in 24-hour format.

Problem

The issue occurred when D3.js default tickFormat() method mixed 12-hour and 24-hour time formats, creating confusing sequences like:

• "8:45", "21", "9:15" (mixing 12-hour minutes with 24-hour hours)
• "08:45", "09 PM", "09:15" (inconsistent format)

Solution

Implemented a custom 24-hour time formatter that replaces D3's default x.tickFormat() in both graphs.server.js and graphs.zone.js:

// Custom 24-hour time formatter to avoid 12-hour format in minute displays
function custom24HourFormatter() {
    var formatMinute = d3.utcFormat("%H:%M"),  // Always use 24-hour format
        formatHour = d3.utcFormat("%H");       // Always use 24-hour format
    // ... other format handlers
    
    return function(date) {
        // Logic to choose appropriate format based on precision needed
    };
}

Result

Time displays are now consistent with 24-hour format throughout:

• ✅ "08:45", "21", "09:15" (consistent 24-hour format)
• ✅ "20:45", "21", "21:15" (proper progression)

Changes

• Modified: docs/shared/static/js/graphs.server.js - Added custom formatter for server graphs
• Modified: docs/shared/static/js/graphs.zone.js - Added custom formatter for zone graphs
• Compatibility: Uses ES5-compatible syntax for broader browser support
• Scope: Minimal changes (8 lines modified per file) affecting only time formatting

Testing

• ✅ Verified syntax with Node.js and JSHint
• ✅ Tested problematic time sequences that caused the original issue
• ✅ Confirmed fix works for both server and zone graph views
• ✅ Maintains all existing graph functionality

Fixes #216.

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[Copilot]

Pull Request Overview

This PR implements a custom 24-hour time formatter to resolve inconsistent time displays in the graphs by replacing D3.js’s default formatter in both server and zone visualizations.

• Improved time formatting logic using a custom formatter for consistent 24-hour display
• Updates made separately in graphs.server.js and graphs.zone.js to address the issue

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
docs/shared/static/js/graphs.zone.js	Added custom24HourFormatter and replaced tickFormat() call
docs/shared/static/js/graphs.server.js	Added custom24HourFormatter and replaced tickFormat() call

[Copilot]

The custom24HourFormatter function is duplicated in multiple files. Consider extracting it to a shared utility module to reduce redundancy and simplify future maintenance.

[Copilot]

The custom24HourFormatter function appears to be identically implemented here as in graphs.zone.js. Extracting this common logic to a shared module could improve maintainability and consistency.