Initial commit: Ebook Translation System with Docker setup

ebook_backend&admin_panel/admin-backend/utils/timezone_utils.py

@@ -0,0 +1,83 @@
+"""
+Timezone utilities for CEST/CET conversion
+"""
+from datetime import datetime, timezone
+import pytz
+
+def get_cest_timezone():
+    """Get CEST/CET timezone (Europe/Berlin)"""
+    return pytz.timezone('Europe/Berlin')
+
+def get_server_timezone():
+    """Get server's local timezone (IST)"""
+    return pytz.timezone('Asia/Kolkata')
+
+def utc_to_cest(utc_datetime):
+    """
+    Convert UTC datetime to CEST/CET timezone
+    
+    Args:
+        utc_datetime: UTC datetime object
+        
+    Returns:
+        datetime object in CEST/CET timezone
+    """
+    if utc_datetime is None:
+        return None
+    
+    # Ensure the datetime is timezone-aware
+    if utc_datetime.tzinfo is None:
+        utc_datetime = utc_datetime.replace(tzinfo=timezone.utc)
+    
+    cest_tz = get_cest_timezone()
+    return utc_datetime.astimezone(cest_tz)
+
+def local_to_cest(local_datetime):
+    """
+    Convert local server time (IST) to CEST/CET timezone
+    
+    Args:
+        local_datetime: Local datetime object (from server)
+        
+    Returns:
+        datetime object in CEST/CET timezone
+    """
+    if local_datetime is None:
+        return None
+    
+    # First, make the local datetime timezone-aware
+    ist_tz = get_server_timezone()
+    if local_datetime.tzinfo is None:
+        local_datetime = ist_tz.localize(local_datetime)
+    
+    # Convert to CEST/CET
+    cest_tz = get_cest_timezone()
+    return local_datetime.astimezone(cest_tz)
+
+def format_cest_datetime(utc_datetime, format_str="%Y-%m-%d %H:%M:%S"):
+    """
+    Format UTC datetime to CEST/CET timezone string
+    
+    Args:
+        utc_datetime: UTC datetime object
+        format_str: Format string for datetime
+        
+    Returns:
+        Formatted string in CEST/CET timezone
+    """
+    if utc_datetime is None:
+        return None
+    
+    # Convert local server time to CEST/CET
+    cest_datetime = local_to_cest(utc_datetime)
+    return cest_datetime.strftime(format_str)
+
+def now_cest():
+    """
+    Get current time in CEST/CET timezone
+    
+    Returns:
+        datetime object in CEST/CET timezone
+    """
+    cest_tz = get_cest_timezone()
+    return datetime.now(cest_tz)