Use TIME_ZONE environment variable when available

Connects to archivematica/Issues#291

Co-authored-by: Jesús García Crespo <[email protected]>

install/README.md

@@ -59,6 +59,11 @@ of these settings or provide values to mandatory fields.
     - **Type:** `string`
     - :red_circle: **Mandatory!**
 
+- **`TIME_ZONE`**:
+    - **Description:** application time zone. See [TIME_ZONE](https://docs.djangoproject.com/en/1.8/ref/settings/#time-zone) for more details.
+    - **Type:** `string`
+    - **Default:** `"America/Los_Angeles"`
+
 - **`SECRET_KEY`**:
     - **Description:** a secret key used for cryptographic signing. See [SECRET_KEY](https://docs.djangoproject.com/en/1.8/ref/settings/#secret-key) for more details.
     - **Type:** `string`

storage_service/storage_service/settings/base.py

@@ -67,7 +67,7 @@ def get_env_variable(var_name):
 
 # ######## GENERAL CONFIGURATION
 # See: https://docs.djangoproject.com/en/dev/ref/settings/#time-zone
-TIME_ZONE = "America/Los_Angeles"
+TIME_ZONE = environ.get("TIME_ZONE", "America/Los_Angeles")
 
 # See: https://docs.djangoproject.com/en/dev/ref/settings/#language-code
 LANGUAGE_CODE = "en-us"