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Are join dates from the API correct?

meetup_members <- read_csv("latest/rladies_meetup_members.csv")
meetup_groups <- read_csv("latest/rladies_meetup_groups.csv")

# compare join date with group.profile.created date

meetup_members_join_date <- meetup_members %>%
  select(id, status, joined, group_profile.created, group_profile.visited, group_profile.updated, group_profile.group.urlname) %>%
  mutate(
    joined=floor_date(as.POSIXct(joined/1000, tz="UTC", origin="1970-01-01"), unit="days"),
    group_profile.created=floor_date(as.POSIXct(group_profile.created/1000, tz="UTC", origin="1970-01-01"), unit="days"),
    group_profile.visited=floor_date(as.POSIXct(group_profile.visited/1000, tz="UTC", origin="1970-01-01"), unit="days"),
    group_profile.updated=floor_date(as.POSIXct(group_profile.updated/1000, tz="UTC", origin="1970-01-01"), unit="days")
  )

meetup_members_join_date <- meetup_members_join_date %>%
  inner_join(meetup_groups %>% select(urlname, created, members) %>% unique(), by=c("group_profile.group.urlname"="urlname"))

meetup_members_join_date <- meetup_members_join_date %>%
  mutate(
    created=floor_date(as.POSIXct(created/1000, tz="UTC", origin="1970-01-01"), unit="days")
  ) %>%
  rename(group_profile.group.created=created,
         group_profile.group.members=members) # for consistency

meetup_groups_top <- meetup_groups %>%
  top_n(20, members) %>%
  select(urlname)

meetup_members_sample <- meetup_members_join_date %>%
  filter(group_profile.group.urlname %in% meetup_groups_top$urlname) %>%
  group_by(group_profile.group.urlname) %>%
  sample_n(10)

meetup_members_join_date_melt <- melt(meetup_members_sample, id=c("id", "group_profile.group.urlname"),
                                      measure=c("joined", "group_profile.created", "group_profile.group.created"))


ggplot(meetup_members_join_date_melt, 
       aes(x=factor(id), y=factor(value))) +
  geom_line(aes(group=factor(id))) +
  geom_point(aes(color=variable, group=variable)) +
  theme(axis.text.y=element_blank(), axis.text.x=element_blank()) +
  facet_wrap(~ group_profile.group.urlname, scales="free") +
  labs(x="Member", y="Date")