Added timezone support

Cargo.lock

@@ -3255,7 +3255,7 @@ dependencies = [
 
 [[package]]
 name = "web-petting"
-version = "0.1.3"
+version = "0.1.4"
 dependencies = [
  "chrono",
  "chrono-tz",

src/tz.rs

@@ -0,0 +1,31 @@
+use chrono::TimeZone;
+use chrono_tz::Tz;
+use cot::db::{Database, Model, query};
+
+use crate::models::Setting;
+
+const DEFAULT_TZ: &str = "UTC";
+
+/// Load timezone from the database settings.
+pub async fn load_tz(db: &Database) -> Tz {
+    let key = "timezone".to_string();
+    let tz_str = query!(Setting, $key == key)
+        .get(db)
+        .await
+        .ok()
+        .flatten()
+        .map(|s| s.value)
+        .unwrap_or_else(|| DEFAULT_TZ.to_string());
+    tz_str.parse::<Tz>().unwrap_or(Tz::UTC)
+}
+
+/// Current date+time in the configured timezone, returned as NaiveDateTime.
+#[allow(dead_code)]
+pub fn now_in_tz(tz: Tz) -> chrono::NaiveDateTime {
+    chrono::Utc::now().with_timezone(&tz).naive_local()
+}
+
+/// Today's date in the configured timezone.
+pub fn today_in_tz(tz: Tz) -> chrono::NaiveDate {
+    chrono::Utc::now().with_timezone(&tz).date_naive()
+}