[R-sig-Geo] space time variogram

[Jonesmus Wambua]

hi,
am specifying a variogram with 53 years by generating the time variable as
follows:

time <- as.POSIXct(paste0(1960:2012,"-01-01"), tz = "GMT")

When i generate the map variagram, it comes with time in thousands (see
attached map). how can i make sure that it gives time in years with a
reasonable range?
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