[R] Help with strftime error "character string is not in a standard unambiguous format"

Chris Evans chrishold at psyctc.org
Mon Sep 12 07:57:39 CEST 2016

I am trying to read activity data created by Garmin. It outputs dates like this:

"Thu, 25 Aug 2016 6:34 PM"

The problem that has stumped me is this:

> strftime("Thu, 25 Aug 2016 6:34 PM",format="%a, %d %b %Y %I:%M %p")
Error in as.POSIXlt.character(x, tz = tz) : 
  character string is not in a standard unambiguous format

I _thought_ I had this running OK but that error is catching me now.  I think I've read ?strftime and written that format string correctly to match the input but I'm stumped now.

Can someone advise me?  Many thanks in advance,


> sessionInfo()
R version 3.3.1 (2016-06-21)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 10586)

[1] LC_COLLATE=English_United Kingdom.1252 
[2] LC_CTYPE=English_United Kingdom.1252   
[3] LC_MONETARY=English_United Kingdom.1252
[4] LC_NUMERIC=C                           
[5] LC_TIME=English_United Kingdom.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] compiler_3.3.1 tools_3.3.1   

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