Oh, I'm sorry to be posting a reply to my own stupid question, but the
problem is that I had not specified GMT, and so it was using local time,
which changes to 'save daylight". This is demonstrated below:
> unclass(as.POSIXct("1975-04-27",tz="GMT"))[1]-unclass(as.POSIXct("1975-04-28",tz="GMT"))[1]
[1] -86400
> unclass(as.POSIXct("1975-04-27"))[1]-unclass(as.POSIXct("1975-04-28"))[1]
[1] -82800
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