From 561ed63ac782ccb7f29c93aae5906ee797de5703 Mon Sep 17 00:00:00 2001
From: pavel <pavelflegr@gmail.com>
Date: Wed, 8 Apr 2026 21:54:57 +0200
Subject: [PATCH] timezone

---
 .env.example              | 1 +
 README.md                 | 1 +
 internal/config/config.go | 2 ++
 internal/http/app.go      | 9 ++++++++-
 internal/http/render.go   | 8 ++++++--
 5 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/.env.example b/.env.example
index 1e9326e..c2e1cd6 100644
--- a/.env.example
+++ b/.env.example
@@ -4,3 +4,4 @@ SESSION_KEY=dev-session-key-change-me
 APP_ENV=development
 ADMIN_EMAIL=admin@superbanka.local
 ADMIN_PASSWORD=admin123456
+TIMEZONE=UTC
diff --git a/README.md b/README.md
index 6b78ea1..53bda15 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ The app listens on `http://localhost:8080` by default.
 Postgres is exposed on `localhost:5433` to avoid conflicts with any existing local instance.
 
 The app loads `.env` automatically on startup. Existing shell environment variables still take precedence over values in `.env`.
+Set `TIMEZONE` to any IANA timezone name such as `UTC` or `Europe/Prague` to control how timestamps are rendered in the UI.
 
 Default bootstrap admin credentials:
 
diff --git a/internal/config/config.go b/internal/config/config.go
index b648910..b9690bb 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -14,6 +14,7 @@ type Config struct {
 	AppEnv      string
 	AdminEmail  string
 	AdminPass   string
+	Timezone    string
 }
 
 func Load() Config {
@@ -28,6 +29,7 @@ func Load() Config {
 		AppEnv:      getenv("APP_ENV", "development"),
 		AdminEmail:  getenv("ADMIN_EMAIL", "admin@superbanka.local"),
 		AdminPass:   getenv("ADMIN_PASSWORD", "admin123456"),
+		Timezone:    getenv("TIMEZONE", "UTC"),
 	}
 }
 
diff --git a/internal/http/app.go b/internal/http/app.go
index 4d24bcd..c65107d 100644
--- a/internal/http/app.go
+++ b/internal/http/app.go
@@ -97,8 +97,15 @@ func NewApp(cfg config.Config) (*App, error) {
 		return nil, fmt.Errorf("run migrations: %w", err)
 	}
 
+	location, err := time.LoadLocation(cfg.Timezone)
+	if err != nil {
+		dbPool.Close()
+		return nil, fmt.Errorf("load timezone %q: %w", cfg.Timezone, err)
+	}
+	time.Local = location
+
 	store := db.NewStore(dbPool)
-	renderer, err := NewRenderer()
+	renderer, err := NewRenderer(location)
 	if err != nil {
 		dbPool.Close()
 		return nil, err
diff --git a/internal/http/render.go b/internal/http/render.go
index bdc171f..bb70f9d 100644
--- a/internal/http/render.go
+++ b/internal/http/render.go
@@ -25,7 +25,11 @@ type Renderer struct {
 	templates *template.Template
 }
 
-func NewRenderer() (*Renderer, error) {
+func NewRenderer(location *time.Location) (*Renderer, error) {
+	if location == nil {
+		location = time.UTC
+	}
+
 	funcs := template.FuncMap{
 		"money": platform.FormatCZK,
 		"dt": func(t time.Time) string {
@@ -33,7 +37,7 @@ func NewRenderer() (*Renderer, error) {
 				return ""
 			}
 
-			return t.Format("02. 01. 2006 15:04")
+			return t.In(location).Format("02. 01. 2006 15:04")
 		},
 	}