dhcp.py T6998 - make similar change for ipv6

src/op_mode/dhcp.py

@@ -101,7 +101,7 @@ def _get_raw_server_leases(family='inet', pool=None, sorted=None, state=[], orig
         lifetime = lease['valid-lft']
         expiry = (lease['cltt'] + lifetime)
 
-        lease['start_timestamp'] = datetime.fromtimestamp(expiry - lifetime, timezone.utc)
+        lease['start_timestamp'] = datetime.fromtimestamp(lease['cltt'], timezone.utc)
         lease['expire_timestamp'] = datetime.fromtimestamp(expiry, timezone.utc) if expiry else None
 
         data_lease = {}
@@ -170,8 +170,8 @@ def _get_formatted_server_leases(raw_data, family='inet'):
             ipaddr = lease.get('ip')
             hw_addr = lease.get('mac')
             state = lease.get('state')
-            start = datetime.fromtimestamp(lease.get('start'))
-            end = datetime.fromtimestamp(lease.get('end')) if lease.get('end') else '-'
+            start = datetime.fromtimestamp(lease.get('start'), timezone.utc)
+            end = datetime.fromtimestamp(lease.get('end'), timezone.utc) if lease.get('end') else '-'
             remain = lease.get('remaining')
             pool = lease.get('pool')
             hostname = lease.get('hostname')
@@ -185,10 +185,8 @@ def _get_formatted_server_leases(raw_data, family='inet'):
         for lease in raw_data:
             ipaddr = lease.get('ip')
             state = lease.get('state')
-            start = lease.get('last_communication')
-            start =  _utc_to_local(start).strftime('%Y/%m/%d %H:%M:%S')
-            end = lease.get('end')
-            end =  _utc_to_local(end).strftime('%Y/%m/%d %H:%M:%S')
+            start = datetime.fromtimestamp(lease.get('last_communication'), timezone.utc)
+            end = datetime.fromtimestamp(lease.get('end'), timezone.utc) if lease.get('end') else '-'
             remain = lease.get('remaining')
             lease_type = lease.get('type')
             pool = lease.get('pool')