diff --git a/backend/src/handlers/events.rs b/backend/src/handlers/events.rs
index 0290d6d..cb19856 100644
--- a/backend/src/handlers/events.rs
+++ b/backend/src/handlers/events.rs
@@ -845,7 +845,7 @@ fn parse_event_datetime(
     time_str: &str,
     all_day: bool,
 ) -> Result<chrono::DateTime<chrono::Utc>, String> {
-    use chrono::{NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc};
+    use chrono::{Local, NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc};
 
     // Parse the date
     let date = NaiveDate::parse_from_str(date_str, "%Y-%m-%d")
@@ -865,7 +865,11 @@ fn parse_event_datetime(
         // Combine date and time
         let datetime = NaiveDateTime::new(date, time);
 
-        // Assume local time and convert to UTC (in a real app, you'd want timezone support)
-        Ok(Utc.from_utc_datetime(&datetime))
+        // Treat the datetime as local time and convert to UTC
+        let local_datetime = Local.from_local_datetime(&datetime)
+            .single()
+            .ok_or_else(|| "Ambiguous local datetime".to_string())?;
+        
+        Ok(local_datetime.with_timezone(&Utc))
     }
 }
diff --git a/backend/src/handlers/series.rs b/backend/src/handlers/series.rs
index 92082b5..d8911eb 100644
--- a/backend/src/handlers/series.rs
+++ b/backend/src/handlers/series.rs
@@ -130,9 +130,17 @@ pub async fn create_event_series(
             .and_hms_opt(23, 59, 59)
             .ok_or_else(|| ApiError::BadRequest("Invalid end date".to_string()))?;
 
+        // Convert from local time to UTC
+        let start_local = chrono::Local.from_local_datetime(&start_dt)
+            .single()
+            .ok_or_else(|| ApiError::BadRequest("Ambiguous start datetime".to_string()))?;
+        let end_local = chrono::Local.from_local_datetime(&end_dt)
+            .single()
+            .ok_or_else(|| ApiError::BadRequest("Ambiguous end datetime".to_string()))?;
+        
         (
-            chrono::Utc.from_utc_datetime(&start_dt),
-            chrono::Utc.from_utc_datetime(&end_dt),
+            start_local.with_timezone(&chrono::Utc),
+            end_local.with_timezone(&chrono::Utc),
         )
     } else {
         // Parse times for timed events
@@ -163,9 +171,17 @@ pub async fn create_event_series(
             start_date.and_time(end_time)
         };
 
+        // Convert from local time to UTC
+        let start_local = chrono::Local.from_local_datetime(&start_dt)
+            .single()
+            .ok_or_else(|| ApiError::BadRequest("Ambiguous start datetime".to_string()))?;
+        let end_local = chrono::Local.from_local_datetime(&end_dt)
+            .single()
+            .ok_or_else(|| ApiError::BadRequest("Ambiguous end datetime".to_string()))?;
+        
         (
-            chrono::Utc.from_utc_datetime(&start_dt),
-            chrono::Utc.from_utc_datetime(&end_dt),
+            start_local.with_timezone(&chrono::Utc),
+            end_local.with_timezone(&chrono::Utc),
         )
     };
 
@@ -401,9 +417,17 @@ pub async fn update_event_series(
             .and_hms_opt(23, 59, 59)
             .ok_or_else(|| ApiError::BadRequest("Invalid end date".to_string()))?;
 
+        // Convert from local time to UTC
+        let start_local = chrono::Local.from_local_datetime(&start_dt)
+            .single()
+            .ok_or_else(|| ApiError::BadRequest("Ambiguous start datetime".to_string()))?;
+        let end_local = chrono::Local.from_local_datetime(&end_dt)
+            .single()
+            .ok_or_else(|| ApiError::BadRequest("Ambiguous end datetime".to_string()))?;
+        
         (
-            chrono::Utc.from_utc_datetime(&start_dt),
-            chrono::Utc.from_utc_datetime(&end_dt),
+            start_local.with_timezone(&chrono::Utc),
+            end_local.with_timezone(&chrono::Utc),
         )
     } else {
         let start_time = if !request.start_time.is_empty() {
@@ -438,9 +462,17 @@ pub async fn update_event_series(
             (chrono::Utc.from_utc_datetime(&start_dt) + original_duration).naive_utc()
         };
 
+        // Convert from local time to UTC
+        let start_local = chrono::Local.from_local_datetime(&start_dt)
+            .single()
+            .ok_or_else(|| ApiError::BadRequest("Ambiguous start datetime".to_string()))?;
+        let end_local = chrono::Local.from_local_datetime(&end_dt)
+            .single()
+            .ok_or_else(|| ApiError::BadRequest("Ambiguous end datetime".to_string()))?;
+        
         (
-            chrono::Utc.from_utc_datetime(&start_dt),
-            chrono::Utc.from_utc_datetime(&end_dt),
+            start_local.with_timezone(&chrono::Utc),
+            end_local.with_timezone(&chrono::Utc),
         )
     };