R Under development (unstable) (2024-09-21 r87186 ucrt) -- "Unsuffered Consequences"
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> 
> ## Test of date and datetime types, based on earlier version in inst/devTests
> ##
> ## Dirk Eddelbuettel, 21 Oct 2008
> 
> dbTypeTests <- function(con, dateclass="timestamp without time zone", tz="UTC") {
+     cat("\n\n**** Trying with ", dateclass, "\n")
+ 
+     if (dbExistsTable(con, "tempostgrestable"))
+         dbRemoveTable(con, "tempostgrestable")
+ 
+     dbGetQuery(con, paste("create table tempostgrestable (tt ", dateclass, ", zz integer);", sep=""))
+     insstring <- '2008-07-01 14:15:16.123+00'
+     cat(paste('inserted string 1:', insstring))
+     cat("\n")
+     dbGetQuery(con, paste("insert into tempostgrestable values('", insstring, "', 1);", sep=""))
+ 
+ #    now <- ISOdatetime(2000,1,2,3,4,5.678)
+     insstring <- '2000-01-02 03:04:05.678+00'
+     cat(paste('inserted string 2:', insstring))
+     cat("\n")
+     dbGetQuery(con, paste("insert into tempostgrestable values('", insstring, "', 2);", sep=""))
+     tt<-as.POSIXct(c("2008-07-01 23:45:16.123+0930","2000-01-02 13:34:05.678+1030"), format="%Y-%m-%d %H:%M:%OS%z")
+     print(tt)
+ 
+     dbGetQuery(con, paste("SET TIMEZONE TO '", tz, "'", sep=""))
+ 
+     data <- dbGetQuery(con, "select tt from tempostgrestable;")
+ 
+     times <- data[,1]
+     print(times)
+     if(as.double(tt[1]) == as.double(times[1])){
+       cat('PASS\n')
+     }else{
+       cat('FAIL\n')
+     }
+     if(as.double(tt[2]) == as.double(times[2])){
+       cat('PASS\n')
+     }else{
+       cat('FAIL\n')
+     }
+ 
+ 
+     dbRemoveTable(con, "tempostgrestable")
+     invisible(NULL)
+ }
> 
> ## only run this if this env.var is set correctly
> if ((Sys.getenv("POSTGRES_USER") != "") &
+     (Sys.getenv("POSTGRES_HOST") != "") &
+     (Sys.getenv("POSTGRES_DATABASE") != "")) {
+ 
+     ## try to load our module and abort if this fails
+     stopifnot(require(RPostgreSQL))
+ 
+     ## Force a timezone to make the tests comparable at different locations
+     Sys.setenv("TZ"="UTC")
+     tt<-as.POSIXct(c("2008-07-01 23:45:16.123+0930","2000-01-02 13:34:05.678+1030"), format="%Y-%m-%d %H:%M:%OS%z")
+     print(tt)
+ 
+     ## load the PostgresSQL driver
+     drv <- dbDriver("PostgreSQL")
+     ## can't print result as it contains process id which changes  print(summary(drv))
+ 
+     ## connect to the default db
+     con <- dbConnect(drv,
+                      user=Sys.getenv("POSTGRES_USER"),
+                      password=Sys.getenv("POSTGRES_PASSWD"),
+                      host=Sys.getenv("POSTGRES_HOST"),
+                      dbname=Sys.getenv("POSTGRES_DATABASE"),
+                      port=ifelse((p<-Sys.getenv("POSTGRES_PORT"))!="", p, 5432))
+ 
+     cat('testing UTC')
+     dbTypeTests(con, "timestamp")
+     dbTypeTests(con, "timestamp with time zone")
+     cat('testing Asia/Tokyo')
+     dbTypeTests(con, "timestamp", tz="Asia/Tokyo")
+     dbTypeTests(con, "timestamp with time zone", tz="Asia/Tokyo")
+     cat('testing Australlia/South')
+     dbTypeTests(con, "timestamp", tz="Australia/South")
+     dbTypeTests(con, "timestamp with time zone", tz="Australia/South")
+     cat('testing America/New_York')
+     dbTypeTests(con, "timestamp", tz="America/New_York")
+     dbTypeTests(con, "timestamp with time zone", tz="America/New_York")
+ 
+     dbDisconnect(con)
+ }
> 
> 
> proc.time()
   user  system elapsed 
   0.14    0.03    0.15