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Working Calendar

A working calendar (calendar: { workingDays, holidays }): non-working days are shaded and muted, holidays are tinted and named, tasks given as start + duration count working days, the Duration column counts working days and dragging keeps a task's working-day length while skipping the closed days. Below 960 px the grid switches to a task/progress summary; all task data are retained. Use a wider view for the full columns.

Chart type
Gantt gantt
Tier
Premium
Collection
Gantt
Render
Live, site theme
View .md Agent setup
LIVE/gantt/working-calendar8 of 35 in Gantt

Open the chart without page chrome ↗Drawing width at least 1,024 px. Scroll within the chart on smaller screens.

Configuration

Raw Standalone 
const options = {
  "responsive": [
    {
      "breakpoint": 960,
      "options": {
        "plotOptions": {
          "gantt": {
            "grid": {
              "width": 180,
              "columns": [
                {
                  "key": "name",
                  "header": "Task / progress",
                  "value": (_raw, { task }) => (Number.isFinite(task.progress) ? Math.round(task.progress) + '% · ' : '') + task.name
                }
              ]
            }
          }
        }
      }
    }
  ],
  "chart": {
    "height": "auto",
    "toolbar": {
      "show": false
    },
    "type": "gantt",
    "events": {
      "taskChange": (e, ctx, o) => {
              const message = o.task.name + ' → ' + new Date(o.start).toDateString() + ' – ' + new Date(o.end - 1).toDateString()
              const output = ctx.el && ctx.el.ownerDocument && ctx.el.ownerDocument.querySelector('#stage .g-log')
              if (output) output.textContent = message
              else console.log(message)
            }
    }
  },
  "series": [
    {
      "name": "Release 7.2",
      "data": [
        {
          "id": "a",
          "name": "API hardening",
          "start": "2026-11-16",
          "duration": 5,
          "progress": 80
        },
        {
          "id": "b",
          "name": "Billing webhooks",
          "start": "2026-11-19",
          "duration": 6,
          "progress": 40,
          "dependsOn": [
            "a"
          ]
        },
        {
          "id": "c",
          "name": "Invoice PDFs",
          "start": "2026-11-25",
          "duration": 4,
          "progress": 10,
          "dependsOn": [
            "b"
          ]
        },
        {
          "id": "d",
          "name": "Load test",
          "start": "2026-12-01",
          "duration": 2,
          "dependsOn": [
            "c"
          ]
        },
        {
          "id": "e",
          "name": "Release",
          "start": "2026-12-03",
          "milestone": true,
          "dependsOn": [
            "d"
          ]
        }
      ]
    }
  ],
  "plotOptions": {
    "gantt": {
      "today": {
        "show": false
      },
      "drag": {
        "enabled": true
      },
      "calendar": {
        "workingDays": [
          1,
          2,
          3,
          4,
          5
        ],
        "holidays": [
          {
            "date": "2026-11-26",
            "name": "Thanksgiving"
          },
          {
            "date": "2026-11-27",
            "name": "Day after"
          }
        ]
      },
      "grid": {
        "width": 310,
        "columns": [
          "name",
          {
            "key": "start",
            "width": 64
          },
          {
            "key": "duration",
            "width": 48
          }
        ]
      },
      "range": {
        "min": 1794610800000,
        "max": 1796511600000
      }
    }
  },
  "theme": {
    "mode": "light",
    "preset": "coastal"
  }
}

const chart = new WestCoastCharts(document.querySelector('#chart'), options)
chart.render()

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