abline(v= x) in plot with time formated xaxis not working

Sorry for the lack of the plot. It's is just a simple xy plot with xvalues
formated as shown in my post (strptime()).

Anyway, here a working example:

rm(list=ls())

x<-c(100*1500:1559, 100*1600:1659)
x<-strptime(x, format="%H%M%S")
y<-c(CO2$conc, CO2$conc[1:36])

plot(x, y, pch=18, type="p", ylab="yfoo", xlab="xfoo", yaxs="r")

abline(h=100, v=0, col="gray60", lty=2)
text.xvalue<-151500
text.xvalue<-strptime(text.xvalue, format="%H%M%S")
text(text.xvalue, 80, "detection threshold", col="gray60", cex=0.8)

event.1<-152833
event.1<-strptime(event.1, format="%H%M%S")
abline(v=event.1, col="red")

The format for the xvalues works in the case of text positioning, but
doesn't in the case of abline. 

JimHoltman replied this topic via email with a solution:

<-as.POSIXct(strptime(y, format="%H%M%S"))


I still don't know why this second function is necessary since everything
works without it, except for the abline-thing...

Nevertheless, thanks for all the suggestions!

Fritz

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