Why wont this script actually plot the open and close prices?

4 ก.ย. 2020

As you can see on the chart, the open and close prices are not where the lines are. Please help.
Thank you

// This source code is subject to the terms of the Mozilla Public License 2.0 at mozilla.org/MPL/2.0/
// © bradchris24

//version=4

study("Short Term Levels me", shorttitle="STL", overlay=true)
t = time("1440", "0000-0930")

dclose = security(syminfo.tickerid, "D", close[1])
dopen = security(syminfo.tickerid, "D", open)

is_first = na(t[1]) and not na(t) or t[1] < t
ending_hour = input(defval=9, title="Ending Hour", type=input.integer)
ending_minute = input(defval=30, title="Ending Minute", type=input.integer)

day_high = float(na)

if is_first and barstate.isnew and (hour < ending_hour or hour >= 16 or hour == ending_hour and minute < ending_minute)
day_high := high
else
day_high := day_high[1]

if high > day_high and ((hour < ending_hour or hour >= 16) and hour < 16 or hour == ending_hour and minute < ending_minute)
day_high := high
day_high


plot(day_high, style=plot.style_line, color=color.yellow, linewidth=1)
plot(dclose, style=plot.style_line, color=color.green, linewidth=1)
plot(dopen, style=plot.style_line, color=color.red, linewidth=1)