Accept jam_date as optional argument in daily-jams patch

We want to create daily jams playlists in LB based on user timezones so
that those are ready by the time they wake up. This means that the patch
needs to take into account timezones when calculating the jam date to
display to users. One way to do that would be to accept a timezone
parameter and let the patch calculate the current day based on that. But
the other way to accept a jam date directly seems more flexible and
easier so doing that.

Author: amCap1712

troi/patches/daily_jams.py

@@ -25,12 +25,15 @@ class DailyJamsPatch(troi.patch.Patch):
     @staticmethod
     @cli.command(no_args_is_help=True)
     @click.argument('user_name')
+    @click.argument('jam_date', required=False)
     def parse_args(**kwargs):
         """
         Generate a daily playlist from the ListenBrainz recommended recordings.
 
         \b
         USER_NAME is a MusicBrainz user name that has an account on ListenBrainz.
+        JAM_DATE is the date for which the jam is created (this is needed to account for the fact different timezones
+        can be on different dates). Recommended formatting for the date is 'YYYY-MM-DD DAY_OF_WEEK'.
         """
 
         return kwargs
@@ -49,6 +52,9 @@ def description():
 
     def create(self, inputs, patch_args):
         user_name = inputs['user_name']
+        jam_date = inputs.get('jam_date')
+        if jam_date is None:
+            jam_date = datetime.utcnow().strftime("%Y-%m-%d %a")
 
         raw_recs = troi.listenbrainz.recs.UserRecordingRecommendationsElement(user_name=user_name,
                                                                               artist_type="raw",
@@ -59,9 +65,6 @@ def create(self, inputs, patch_args):
         latest_filter = troi.filters.LatestListenedAtFilterElement(14)
         latest_filter.set_sources(raw_recs_lookup)
 
-        jam_date = datetime.utcnow()
-        jam_date = jam_date.strftime("%Y-%m-%d %a")
-
         pl_maker = PlaylistMakerElement(name="Daily Jams for %s, %s" % (user_name, jam_date),
                                         desc="Daily jams playlist!",
                                         patch_slug=self.slug())