documentclass{article}
usepackage{pgfplots}
pgfplotsset{width=14cm,compat=newest}
usepgfplotslibrary{dateplot}

begin{filecontents*}{data.csv}
count  date
38  2015-01-28
5  2015-02-11
21  2015-02-15
1  2015-02-16
21  2015-02-17
21  2015-02-18
62  2015-02-19
16  2015-02-25
4  2015-02-26
1  2015-02-30
1  2015-03-07
44  2015-04-07
end{filecontents*}

begin{document}
begin{tikzpicture}
pgfplotstableread{data.csv}table
begin{axis}[
    date coordinates in = x,
    date ZERO = 2015-01-28,
    ymin = 0,
    x tick label style = {font = small, text width = 1.7cm, align = center, rotate = 70, anchor = north east},
    xtick = data,
    xticklabels from table = table{date}
    ]
addplot [only marks, blue] table [x = date, y = count] table;%
addplot [green] table [x = date, y = count] table;%
end{axis}
end{tikzpicture}
end{document}

documentclass{article}
usepackage{pgfplots,pgfplotstable}
usepackage{filecontents}
pgfplotsset{width=14cm,compat=1.12}

begin{filecontents*}{data.csv}
count  date
38  2015-01-28
5  2015-02-11
21  2015-02-15
1  2015-02-16
21  2015-02-17
21  2015-02-18
62  2015-02-19
16  2015-02-25
4  2015-02-26
1  2015-02-30
1  2015-03-07
44  2015-04-07
end{filecontents*}

begin{document}
begin{tikzpicture}
pgfplotstableread{data.csv}data
begin{axis}[
    ymin = 0,
    x tick label style = {font = small, text width = 1.7cm, align = center, rotate = 70, anchor = north east},
    xtick=data,
    xticklabels from table = data{date}
    ]
addplot [green,mark=*, mark options={blue}] table [x expr=coordindex, y = count] data;
end{axis}
end{tikzpicture}
end{document}