The one with the burndown chart .

This chart was part of the Week 18 Workout Wednesday  challenge.

  Dataset

The dataset can be found on the Workout Wednesday link above.
I’ve added a calculated Date table. The Date table was linked to the Superstore order_date field.

Date = 
VAR __StartYear = YEAR ( MIN ( superstore[order_date] ) )
VAR __EndYear = YEAR ( MAX ( superstore[order_date] ) )

VAR __Calendar = CALENDAR( DATE (__StartYear, 1, 1 ), DATE ( __EndYear, 12, 31 ) )

VAR __FullTable =
    ADDCOLUMNS(
        __Calendar,
        "Month Year", EOMONTH ( [Date], 0 ),
        "MonthOffSet", DATEDIFF ( NOW(), [Date], MONTH),
        "YearMonth", FORMAT ( [Date], "YYYYMM" ) * 100 ,
        "DateOffSet", DATEDIFF ( NOW(), [Date], DAY )
    )

RETURN
    __FullTable

  Additional fields created

Budget

Budget = 
VAR __HistoricDate =
    CALCULATE( SUM ( Superstore[budget] ) ,'Date'[DateOffSet] < 0 )

VAR __FutureDate =
    CALCULATE ( BLANK() , 'Date'[DateOffSet] >= 0 ) + 0

RETURN
    __HistoricDate + __FutureDate

Budget Used

Budget Used = 
CALCULATE(
	[Budget],
	FILTER(
		ALLSELECTED('Date'[Date]),
		ISONORAFTER('Date'[Date], MAX('Date'[Date]), DESC)
	)
)

Total Budget

Total Budget = 
    CALCULATE ( 
        SUM ( Superstore[budget] ),
        ALL ('Date' )
)

Remaining Budget

Remaining Budget = 
    [Total Budget] - [Budget Used]

Budget FCT

Budget FCT = 
// forecast value
VAR __NumberOfMonths =
    CALCULATE( COUNTROWS( VALUES( 'Date'[Month Year] ) ), ALL( 'Date' ) )

RETURN
    DIVIDE( [Total Budget], __NumberOfMonths )

Budget Used FCT

Budget Used FCT = 
VAR __MaxDate = MAX ('Date'[Date])
VAR __BudgetUsedFCT =
CALCULATE(
    SUMX ( SUMMARIZE(
                'Date',
                'Date'[Month Year],
                "Average Monthly", [Budget FCT]
            ), [Average Monthly] ),
	FILTER(
		ALLSELECTED('Date'[Date]),
		ISONORAFTER('Date'[Date], MAX('Date'[Date]), DESC)
	)
)

RETURN 
    __BudgetUsedFCT

Remaining Budget FCT

Remaining Budget FCT = 
    [Total Budget] - [Budget Used FCT]

  Fields used

• Month Year (month)
• Remaining Budget FCT (fct)
• Remaining Budget (act)
• Today (today)
• MonthOffset (monthoffset)

  Specification

The specification in a nutshell:

layer 
  * rect (greyed out box for future values)
  * line (for the actual value)
  * line (for the forecasted value)
  * rule (for today's date)
  * text (display "Future")

  View chart

Open the Chart in the Vega Editor

  JSON template

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "usermeta": {
    "deneb": {
      "build": "1.2.0.1",
      "metaVersion": 1,
      "provider": "vegaLite",
      "providerVersion": "5.2.0"
    },
    "interactivity": {
      "tooltip": true,
      "contextMenu": true,
      "selection": false,
      "highlight": false,
      "dataPointLimit": 50
    },
    "information": {
      "name": "The burndown chart",
      "description": "Shows the actual comparison against forecasted or budgeted values",
      "author": "Thys van der Westhuizen",
      "uuid": "5edacd16-8088-43e7-aa6b-d7ab87e204fd",
      "generated": "2022-05-07T12:10:22.816Z"
    },
    "dataset": [
      {
        "key": "__0__",
        "name": "month",
        "description": "Month & Year as x-axis on the chart",
        "type": "dateTime",
        "kind": "column"
      },
      {
        "key": "__1__",
        "name": "monthoffset",
        "description": "Month-offset to current month",
        "type": "numeric",
        "kind": "column"
      },
      {
        "key": "__2__",
        "name": "fct",
        "description": "Forecast/Budget value",
        "type": "numeric",
        "kind": "measure"
      },
      {
        "key": "__3__",
        "name": "act",
        "description": "Actual value",
        "type": "numeric",
        "kind": "measure"
      },
      {
        "key": "__4__",
        "name": "today",
        "description": "Display Today's date on Chart",
        "type": "dateTime",
        "kind": "measure"
      }
    ]
  },
  "config": {
    "autosize": {
      "type": "fit",
      "contains": "padding"
    },
    "view": {"stroke": "transparent"},
    "font": "Segoe UI",
    "arc": {},
    "area": {
      "line": true,
      "opacity": 0.6
    },
    "bar": {},
    "line": {
      "strokeWidth": 3,
      "strokeCap": "round",
      "strokeJoin": "round"
    },
    "path": {},
    "point": {
      "filled": true,
      "size": 35
    },
    "rect": {},
    "shape": {},
    "symbol": {
      "strokeWidth": 1.5,
      "size": 50
    },
    "axis": {
      "ticks": false,
      "grid": false,
      "domain": false,
      "labelColor": "#605E5C",
      "labelFontSize": 12,
      "titleFont": "wf_standard-font, helvetica, arial, sans-serif",
      "titleColor": "#252423",
      "titleFontSize": 16,
      "titleFontWeight": "normal"
    },
    "axisQuantitative": {
      "tickCount": 3,
      "grid": true,
      "gridColor": "#C8C6C4",
      "gridDash": [1, 5],
      "labelFlush": false
    },
    "axisBand": {"tickExtra": true},
    "axisX": {"labelPadding": 5},
    "axisY": {"labelPadding": 10},
    "header": {
      "titleFont": "wf_standard-font, helvetica, arial, sans-serif",
      "titleFontSize": 16,
      "titleColor": "#252423",
      "labelFont": "Segoe UI",
      "labelFontSize": 13.333333333333332,
      "labelColor": "#605E5C"
    },
    "legend": {
      "titleFont": "Segoe UI",
      "titleFontWeight": "bold",
      "titleColor": "#605E5C",
      "labelFont": "Segoe UI",
      "labelFontSize": 13.333333333333332,
      "labelColor": "#605E5C",
      "symbolType": "circle",
      "symbolSize": 75
    }
  },
  "data": {"name": "dataset"},
  "layer": [
    {
      "transform": [
        {
          "filter": "datum['__1__'] >= 0"
        }
      ],
      "mark": {"type": "rect"},
      "encoding": {
        "x": {
          "aggregate": "min",
          "field": "__4__",
          "type": "temporal",
          "timeUnit": "yearmonth",
          "title": null
        },
        "x2": {
          "field": "__0__",
          "aggregate": "max"
        },
        "color": {"value": "#f2f2f2"},
        "opacity": {"value": 0.7}
      }
    },
    {
      "mark": {
        "type": "line",
        "tooltip": true,
        "interpolate": "natural",
        "strokeWidth": 2,
        "point": true
      },
      "encoding": {
        "x": {
          "field": "__0__",
          "type": "temporal",
          "timeUnit": "yearmonth",
          "title": null
        },
        "y": {
          "field": "__3__",
          "type": "quantitative",
          "axis": {
            "format": "$.2s",
            "tickCount": 5,
            "title": null
          }
        },
        "color": {"value": "#bda94e"}
      }
    },
    {
      "mark": {
        "type": "line",
        "tooltip": true,
        "interpolate": "natural",
        "strokeWidth": 1,
        "strokeDash": [1, 4]
      },
      "encoding": {
        "x": {
          "field": "__0__",
          "type": "temporal",
          "timeUnit": "yearmonth",
          "title": null
        },
        "y": {
          "field": "__2__",
          "type": "quantitative"
        }
      }
    },
    {
      "mark": {
        "type": "rule",
        "tooltip": true,
        "interpolate": "natural",
        "strokeWidth": 1,
        "strokeDash": [4, 4]
      },
      "encoding": {
        "x": {
          "field": "__4__",
          "type": "temporal",
          "title": null
        },
        "color": {"value": "#acacac"}
      }
    },
    {
      "mark": {
        "type": "text",
        "font": "Segoe UI Light",
        "fontSize": 13,
        "fontWeight": "normal",
        "dy": -210,
        "dx": 25
      },
      "encoding": {
        "x": {
          "field": "__4__",
          "type": "temporal",
          "title": null
        },
        "text": {"datum": "Future"},
        "color": {"value": "#acacac"}
      }
    }
  ]
}