r - Time Axis Values Incorrect in some ggplot plots but not others -

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forum,

this data looks like:

> data.cvg source: local data frame [938 x 5]                    date    day                time                 parameter  value                 (time) (fctr)              (time)                     (chr)  (dbl) 1  2016-03-05 01:35:03    sat 2016-03-06 01:35:03 terminalgarageutilization 35.367 2  2016-03-05 01:40:01    sat 2016-03-06 01:40:01 terminalgarageutilization 35.350 3  2016-03-05 01:43:18    sat 2016-03-06 01:43:18 terminalgarageutilization 35.350 4  2016-03-05 01:45:01    sat 2016-03-06 01:45:01 terminalgarageutilization 35.350 5  2016-03-05 01:50:02    sat 2016-03-06 01:50:02 terminalgarageutilization 35.333 ..                 ...    ...                 ...                       ...    ...

a new datapoint generated every 5 seconds.

if use code, plot correctly prints data values, time axis. notice, @ time of writing post, last datapoint @ mar 7th, 1:50am est, marked red line ('mon').

ggplot(data.cvg)+geom_line(aes(x=time,y=terminalgarageutilization,color=day))

correct x axis labels

if attempt @ re-formatting x-axis: 

 ggplot(data.cvg)+geom_line(aes(x=time,y=terminalgarageutilization,color=day)) +scale_x_datetime(date_labels = "%h:%m",date_breaks = '2 hours')

i wrong x axis labels: wrong x axis labels

this plot incorrectly labels x-axis 5:00a 5:00a. notice same red line, how it's marked against 5a-7a.

why this?

thanks, rahul

resolved.

the answer include timezone. correct working code:

library(scales)     ggplot(data.cvg)+geom_line(aes(x=time,y=terminalgarageutilization,color=day))+     scale_x_datetime(date_breaks = '2 hours',labels = date_format("%h:%m",tz = "est"))

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