Convert UTC datetime object to a different timezone.

JSON doesn't know about dates, so we have to return a string

crc/scripts/get_localtime.py

@@ -1,5 +1,8 @@
-from crc.scripts.script import Script
 from crc.api.common import ApiError
+from crc.scripts.script import Script
+
+import dateparser
+import pytz
 
 
 class GetLocaltime(Script):
@@ -8,12 +11,24 @@ class GetLocaltime(Script):
         return """Converts a UTC Datetime object into a Datetime object with a different timezone.
         Defaults to US/Eastern"""
 
-    def do_task_validate_only(self, task, study_id, workflow_id, **kwargs):
-        if len(kwargs):
+    def do_task_validate_only(self, task, study_id, workflow_id, *args, **kwargs):
+        if 'timestamp' in kwargs:
             return True
         raise ApiError(code='missing_timestamp',
                        message='You must include a timestamp to convert.')
 
-    def do_task(self, task, study_id, workflow_id, **kwargs):
-        pass
+    def do_task(self, task, study_id, workflow_id, *args, **kwargs):
+        if 'timestamp' in kwargs:
+            timestamp = kwargs['timestamp']
+            if 'timezone' in kwargs:
+                timezone = kwargs['timezone']
+            else:
+                timezone = 'US/Eastern'
+            parsed_timestamp = dateparser.parse(timestamp)
+            localtime = parsed_timestamp.astimezone(pytz.timezone(timezone))
+            return str(localtime)
+
+        else:
+            raise ApiError(code='missing_timestamp',
+                           message='You must include a timestamp to convert.')