auto-compute TODAY-6 months

cmd/http/public/transactions.html

@@ -23,6 +23,13 @@
       }
       f = "." + f
       function init() {
+        const zeroPad = (num, places) => String(num).padStart(places, '0')
+        var d = new Date()
+        d.setMonth(d.getMonth()-6)
+        const replacement = `${d.getFullYear()}-${zeroPad(d.getMonth(), 2)}`
+        var iframe = document.getElementsByTagName("iframe")[0]
+        iframe.src = iframe.src.replace("YYYY-MM", replacement)
+
         load(f)
       }
       function load(f) {
@@ -71,7 +78,7 @@
       </div>
       <details>
         <summary><i>Look at this graph</i></summary>
-        <iframe style="background: white; width: 100%;" src="/api/reg?x=y&mode=reg&likeName=Withdrawal:[0123]&chart=stack&predictionMonths=6&prediction=autoContributions=&bpi=true&zoomStart=2023-01"></iframe>
+        <iframe style="background: white; width: 100%;" src="/api/reg?x=y&mode=reg&likeName=Withdrawal:[0123]&chart=stack&predictionMonths=6&prediction=autoContributions=&bpi=true&zoomStart=YYYY-MM"></iframe>
       </details>
     </details>
     <details open>