x axis wih Date variable shown in numbers rather than "Y-m-d" format

[freyreeste]

making a simple chart like dPlot(Amount~Date, data=cash, type = "area") results in x axis wih Date variable shown in numbers rather than "Y-m-d" format. How can I solve the date format issue?

read a csv file with readr package function read_csv
Parsed with column specification:
cols(
Account = col_character(),
Transaction ID = col_double(),
Timestamp = col_character(),
Date = col_date(format = ""),
Delta = col_number(),
Amount = col_number(),
Cash Change Type = col_character(),
Currency = col_character(),
Contract = col_character()
)
─ Session info ──────────────────────────────────────────────────────────────
setting value
version R version 3.6.1 (2019-07-05)
os Linux Mint 19
system x86_64, linux-gnu
ui RStudio
language en_US
collate en_US.UTF-8
ctype en_US.UTF-8
tz America/Argentina/Buenos_Aires
date 2019-12-16