diff --git a/models/shipcloud_pickup.py b/models/shipcloud_pickup.py
index 12ebe1c..3923bb4 100644
--- a/models/shipcloud_pickup.py
+++ b/models/shipcloud_pickup.py
@@ -1,5 +1,6 @@
 from openerp import api, fields, models
 import logging
+import pytz
 from openerp.exceptions import Warning
 from shipcloud_delivery_carrier import build_sc_addr
 
@@ -38,6 +39,12 @@ class SCPickup(models.Model):
 
     @api.one
     def button_request(self):
+        def field_to_datetime(self, dtfield):
+            tz_name = self._context.get('tz') or self.env.user.tz
+            tz = pytz.timezone(tz_name)
+            dt = fields.Datetime.from_string(dtfield)
+            return fields.Datetime.context_timestamp(self, dt)
+
         # consistency check
         for p in self.pickings:
             if p.carrier_id.delivery_type != 'sc':
@@ -51,9 +58,9 @@ class SCPickup(models.Model):
         for p in self.pickings:
             sc_ship_ids.append({'id': p.sc_shipment_id})
         sc_addr = build_sc_addr(self.address)
-        sc_earliest = fields.Datetime.from_string(self.earliest).astimezone().isoformat()
+        sc_earliest = field_to_datetime(self, self.earliest).isoformat()
+        sc_latest = field_to_datetime(self, self.latest).isoformat()
         _logger.info("earliest: %s -> %s" % (self.earliest, sc_earliest))
-        sc_latest = fields.Datetime.from_string(self.latest).astimezone().isoformat()
         sc_pickup = shipcloud.gen_pickup(sc_addr, sc_earliest, sc_latest, sc_ship_ids, self.carrier)
         # actually use the SC API to request the pickup
         api = self._shipcloud_api()