ggplot2 - Label the points as date in the proper format in ggplot in R -


i plotting line chart using ggplot2 in r. want name points above threshold in proper date format.

my code plotting graph is: 

ggplot(datesubset1, aes(timestamp)) +      geom_line(aes(y = cpu, colour = "orange")) +      geom_line(aes(y = mem), colour = "black")+     scale_x_datetime(date_break = "1 days")+     geom_point(aes (x= timestamp, y=cpu), size = 1,colour = "purple",          subset(datesubset1, cpu>25 ))+     geom_point(aes (x= timestamp, y=mem), size = 1,colour = "blue",          subset(datesubset1, mem>10 ))+     scale_y_continuous(breaks = c(5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80))

my graph looks this:

enter image description here

i want label these points (which above threshold) proper date format dataset has. have tried 

geom_text(aes(y=cpu, label= ifelse(cpu>25, timestamp, '')))

using graph looks like:

enter image description here and

geom_text(aes(y= cpu,label= ifelse(cpu>25, format(timestamp), format =  "%y%m%d %h%m%s",'')))

and

geom_text(aes(y= cpu, label=ifelse(cpu>25, as.date(timestamp), '')))

and

geom_text(aes(y= cpu, label=ifelse(cpu>25, as.date.posixct(timestamp), '')))

string of dataset:

data.frame':     1420 obs. of  3 variables: $ timestamp: posixct, format: "2017-06-28 07:03:02" "2017-06-28 07:06:01"  "2017-06-28 07:09:01" ... $ cpu      : num  0.9 0.8 12.2 3.7 2.3 1.7 1.4 1.1 1 0.9 ... $ mem      : num  1.7 1.8 1.5 1.8 1.8 1.8 1.9 1.9 1.9 2.1 ...

the sample data looks like:

timestamp                cpu   mem 2017-06-28 07:03:02      0.9   1.7 2017-06-28 07:06:01      0.8   1.8 2017-06-28 07:09:01      12.2  1.5 2017-06-28 07:12:01      3.7   1.8 2017-06-28 07:15:01      2.3   1.8

ok, try code:

zz = '    cpu   mem    0.9   1.7    0.8   1.8    12.2  1.5 '  df <- read.table(text = zz, header = true) df  tms = c("2017-06-28 07:03:02", "2017-06-28 07:06:01", "2017-06-28 07:09:01") df = cbind(tms, df) df$tms = as.character(df$tms)  label = as.character(ifelse(df$cpu>10, df$tms, '')) df$tms = as.posixct(df$tms)   ggplot(df, aes(tms)) +    geom_line(aes(y = cpu, colour = "orange")) +    geom_line(aes(y = mem), colour = "black")+   scale_x_datetime(date_break = "1 days")+   geom_point(aes (x= tms, y=cpu), size = 1,colour = "purple",               subset(df, cpu>10))+   geom_point(aes (x= tms, y=mem), size = 1,colour = "blue",               subset(df, mem>1.5))+   scale_y_continuous(breaks = c(5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80))+   geom_text(aes(y= cpu, label=label))

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