Inspirational. Especially the idea of dynamic svg's that respond to content that can become buttons
Inspired by your effort, I built a version that shows the year, and uses now, unless a fieldname is provided. The fieldname needs to contain a date according to the date serial number.
\define svg-date-field(width:"", height:"" fieldname)
<$set name=date-value value={{!!$fieldname$}} emptyValue=<<now "YYYY0MM0DD0hh0mm0ss0XXX">> >
<$set name=month value={{{ [<date-value>format:date[mmm]] }}}>
<$set name=day value={{{ [<date-value>format:date[DD]] }}}>
<$set name=dow value={{{ [<date-value>format:date[DDD]] }}}>
<$set name=year value={{{ [<date-value>format:date[YYYY]] }}}>
aria-label="Calendar" role="img"
viewBox="0 0 512 512" width="$width$" height="$height$">
<path d="M512 455c0 32-25 57-57 57H57c-32 0-57-25-57-57V128c0-31 25-57 57-57h398c32 0 57 26 57 57z" fill="#e0e7ec"/>
<path d="M484 0h-47c2 4 4 9 4 14a28 28 0 1 1-53-14H124c3 4 4 9 4 14A28 28 0 1 1 75 0H28C13 0 0 13 0 28v157h512V28c0-15-13-28-28-28z" fill="#dd2f45"/>
<!--g fill="#f3aab9">
<circle cx="470" cy="142" r="14"/>
<circle cx="470" cy="100" r="14"/>
<circle cx="427" cy="142" r="14"/>
<circle cx="427" cy="100" r="14"/>
<circle cx="384" cy="142" r="14"/>
<circle cx="384" cy="100" r="14"/>
</g-->
<text id="month"
x="32"
y="164"
fill="#fff"
font-family="monospace"
font-size="140px"
style="text-anchor: left"><<month>></text>
<text id="year"
x="300"
y="164"
fill="#fff"
font-family="monospace"
font-size="80px"
style="text-anchor: right"><<year>></text>
<text id="day"
x="256"
y="400"
fill="#66757f"
font-family="monospace"
font-size="256px"
style="text-anchor: middle"><<day>></text>
<text id="weekday"
x="256"
y="480"
fill="#66757f"
font-family="monospace"
font-size="64px"
style="text-anchor: middle"><<dow>></text>
</svg>
</$set></$set></$set></$set>
\end
<<svg-date-field 64 64>>
<<svg-date-field 64 64 test-date>>