## Not run: 
# # Create an empty graph
# graph <- create_graph()
# 
# # Provide the new graph with a timestamp (if `tz`
# # is not supplied, `GMT` is used as the time zone)
# graph_1 <-
#   set_graph_time(
#     graph,
#     time = "2015-10-25 15:23:00")
# 
# # Provide the new graph with a timestamp that is
# # the current time; the time zone is inferred from
# # the user's locale
# graph_2 <- set_graph_time(graph)
# 
# # The time zone can be updated when a timestamp
# # is present
# graph_2 <-
#   set_graph_time(
#     graph_2,
#     tz = "America/Los_Angeles")
# ## End(Not run)
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