Get Google trends data - problem with output

Hi all,
I have a question relating to the output of R when downloading Google trends data.
I want to download Google trends data for the past 7 days.
My code is:

sink("output1.txt ")
print(head(gtrends(c("VCB"), geo = "VN", time = "now 7-d", gprop = c("web"), category = 7, hl = "en-US",  low_search_volume = TRUE) $interest_over_time))
sink()

And the output is:

                 date hits keyword geo gprop category
1 2018-05-01 16:00:00   41     VCB  VN   web        7
2 2018-05-01 17:00:00   73     VCB  VN   web        7
3 2018-05-01 18:00:00   81     VCB  VN   web        7
4 2018-05-01 19:00:00   72     VCB  VN   web        7
5 2018-05-01 20:00:00   60     VCB  VN   web        7
6 2018-05-01 21:00:00   44     VCB  VN   web        7

My question is: Why there is only 6 observations in the output?

And I also get this:

Warning messages:
1: In as.POSIXlt.POSIXct(x, tz) : unknown timezone 'Asia/Taipei'
2: In as.POSIXlt.POSIXct(x, tz) : unknown timezone 'GMT'
3: In as.POSIXlt.POSIXct(x, tz) : unknown timezone 'America/New_York'
4: In as.POSIXlt.POSIXct(x, tz) : unknown timezone 'Asia/Taipei'
5: In as.POSIXlt.POSIXct(x, tz) : unknown timezone 'GMT'
6: In as.POSIXlt.POSIXct(x, tz) : unknown timezone 'America/New_York'

I guess I need to specify time zone, even if I already set geo=VN?

Thank you.