From 39f550cf9f9647adfba5718f8145681579518798 Mon Sep 17 00:00:00 2001
From: Petar Petrov <MindFreeze@users.noreply.github.com>
Date: Fri, 19 Dec 2025 19:47:18 +0200
Subject: [PATCH] Fix datetime handling in energy charts (#28345)

* Fix datetime handling in energy charts

* PR comment

* Add detailedDailyData parameter to getSuggestedMax and update getCommonOptions

* refactor

---------

Co-authored-by: Bram Kragten <mail@bramkragten.nl>
---
 .../energy/common/energy-chart-options.ts     | 15 ++++++++---
 .../energy/hui-power-sources-graph-card.ts    | 25 +++++++++++--------
 2 files changed, 26 insertions(+), 14 deletions(-)

diff --git a/src/panels/lovelace/cards/energy/common/energy-chart-options.ts b/src/panels/lovelace/cards/energy/common/energy-chart-options.ts
index d49ac755ae..a2ce47a412 100644
--- a/src/panels/lovelace/cards/energy/common/energy-chart-options.ts
+++ b/src/panels/lovelace/cards/energy/common/energy-chart-options.ts
@@ -31,7 +31,11 @@ import { formatTime } from "../../../../../common/datetime/format_time";
 import type { ECOption } from "../../../../../resources/echarts/echarts";
 import { filterXSS } from "../../../../../common/util/xss";
 
-export function getSuggestedMax(dayDifference: number, end: Date): number {
+export function getSuggestedMax(
+  dayDifference: number,
+  end: Date,
+  detailedDailyData = false
+): number {
   let suggestedMax = new Date(end);
 
   // Sometimes around DST we get a time of 0:59 instead of 23:59 as expected.
@@ -40,7 +44,9 @@ export function getSuggestedMax(dayDifference: number, end: Date): number {
     suggestedMax = subHours(suggestedMax, 1);
   }
 
-  suggestedMax.setMinutes(0, 0, 0);
+  if (!detailedDailyData) {
+    suggestedMax.setMinutes(0, 0, 0);
+  }
   if (dayDifference > 35) {
     suggestedMax.setDate(1);
   }
@@ -77,7 +83,8 @@ export function getCommonOptions(
   unit?: string,
   compareStart?: Date,
   compareEnd?: Date,
-  formatTotal?: (total: number) => string
+  formatTotal?: (total: number) => string,
+  detailedDailyData = false
 ): ECOption {
   const dayDifference = differenceInDays(end, start);
 
@@ -89,7 +96,7 @@ export function getCommonOptions(
     xAxis: {
       type: "time",
       min: start,
-      max: getSuggestedMax(dayDifference, end),
+      max: getSuggestedMax(dayDifference, end, detailedDailyData),
     },
     yAxis: {
       type: "value",
diff --git a/src/panels/lovelace/cards/energy/hui-power-sources-graph-card.ts b/src/panels/lovelace/cards/energy/hui-power-sources-graph-card.ts
index cf63066b45..f7ea069f8f 100644
--- a/src/panels/lovelace/cards/energy/hui-power-sources-graph-card.ts
+++ b/src/panels/lovelace/cards/energy/hui-power-sources-graph-card.ts
@@ -1,4 +1,4 @@
-import { endOfToday, isToday, startOfToday } from "date-fns";
+import { endOfToday, isSameDay, isToday, startOfToday } from "date-fns";
 import type { HassConfig, UnsubscribeFunc } from "home-assistant-js-websocket";
 import type { PropertyValues } from "lit";
 import { css, html, LitElement, nothing } from "lit";
@@ -132,7 +132,9 @@ export class HuiPowerSourcesGraphCard
         config,
         "kW",
         compareStart,
-        compareEnd
+        compareEnd,
+        undefined,
+        true
       ),
       legend: {
         show: this._config?.show_legend !== false,
@@ -210,14 +212,17 @@ export class HuiPowerSourcesGraphCard
         const { positive, negative } = this._processData(
           statIds[key].stats.map((id: string) => {
             const stats = energyData.stats[id] ?? [];
-            const currentStateWatts = getPowerFromState(this.hass.states[id]);
-            if (currentStateWatts !== undefined) {
-              // getPowerFromState returns power in W; convert to kW for this graph
-              stats.push({
-                start: now,
-                end: now,
-                mean: currentStateWatts / 1000,
-              });
+            if (isSameDay(now, this._start) && isSameDay(now, this._end)) {
+              // Append current state if we are showing today
+              const currentStateWatts = getPowerFromState(this.hass.states[id]);
+              if (currentStateWatts !== undefined) {
+                // getPowerFromState returns power in W; convert to kW for this graph
+                stats.push({
+                  start: now,
+                  end: now,
+                  mean: currentStateWatts / 1000,
+                });
+              }
             }
             return stats;
           })