Store birth and death values as UTC dates.

rq/worker.py

@@ -195,11 +195,10 @@ class Worker(object):
             raise ValueError('There exists an active worker named \'%s\' '
                              'already.' % (self.name,))
         key = self.key
-        now = time.time()
         queues = ','.join(self.queue_names())
         with self.connection._pipeline() as p:
             p.delete(key)
-            p.hset(key, 'birth', now)
+            p.hset(key, 'birth', times.format(times.now(), 'UTC'))
             p.hset(key, 'queues', queues)
             p.sadd(self.redis_workers_keys, key)
             p.expire(key, self.default_worker_ttl)
@@ -212,7 +211,7 @@ class Worker(object):
             # We cannot use self.state = 'dead' here, because that would
             # rollback the pipeline
             p.srem(self.redis_workers_keys, self.key)
-            p.hset(self.key, 'death', time.time())
+            p.hset(self.key, 'death', times.format(times.now(), 'UTC'))
             p.expire(self.key, 60)
             p.execute()