Add support for setting use_timezone

README.md

@@ -20,13 +20,15 @@ octo_block_1hour:
   class: OctoBlock
   region: H
   hour: 1
+  use_timezone: False
 
 octo_block_90minutes:
   module: octoblock
   class: OctoBlock
   region: H
   hour: 1.5
   start_period: now
+  use_timezone: True
   ```
 The module and class sections need to remain as above, other sections should be changed as required.
 
@@ -38,6 +40,7 @@ The module and class sections need to remain as above, other sections should be
 | region       | Yes        | H                |
 | hour         | Yes        | 1                |
 | start_period | Yes        | today            |
+| use_timezone | Yes        | True             |
 
 You can have multiple blocks with different time periods (`hour` setting) or starting points (`start_period` setting) as needed. It will work with whole hour or half hour blocks in the `hour` setting.
 
@@ -59,6 +62,8 @@ Using `now` start_period this has turned on and off a few times within the day a
 
 Using `today` start_period this has only turned on once during the day
 
+`use_timezone` can be set to True or False, and defaults to False, it allows you to specify if the date/time should be displayed in UTC (False), or using Europe/London (True) as the timezone. For example, `2020-03-29T02:00:00Z` or `2020-03-29T03:00:00 BST` respectively.
+
 ### Home Assistant Automation
 
 The created start time sensors can then be used to trigger automations within Home Assistant.

apps/octoblock/octoblock.py

@@ -2,6 +2,8 @@
 import requests
 import json
 import datetime
+import dateutil.parser
+import pytz
 
 
 class OctoBlock(hass.Hass):
@@ -15,6 +17,8 @@ def get_best_period_and_cost(self, kwargs):
         region = self.args.get('region', 'H')
         start_period = self.args.get('start_period', 'now')
         start_period = str(start_period).lower()
+        use_timezone = self.args.get('use_timezone', False)
+
         if start_period == 'today':
             d = datetime.date.today().isoformat() + 'T00:00:00'
         elif start_period == 'now':
@@ -57,6 +61,12 @@ def get_best_period_and_cost(self, kwargs):
         for period in tariffresults:
             if period[str(hours) + '_hour_average'] == self.minprice:
                 self.time = period[u'valid_from']
+                if use_timezone:
+                    fmt = '%Y-%m-%dT%H:%M:%S %Z'
+                    greenwich = pytz.timezone('Europe/London')
+                    date_time = dateutil.parser.parse(self.time)
+                    local_datetime = date_time.astimezone(greenwich)
+                    self.time = local_datetime.strftime(fmt)
                 self.log('Lowest priced {} hour period'.format(str(hours)) +
                          ' starts at: {}'.format(self.time))