POSIXlt time objects 

t0 <- as.POSIXlt(0,origin="2020-02-01",tz="GMT")

(t1 <- as.POSIXlt(t0 + 3630))

[1] "2020-02-01 01:00:30 GMT"

# Get the seconds component of the time point
t1$sec

[1] 30

# Get the minutes component of the time point
t1$min

[1] 0

# Get the hours component
t1$hour

[1] 1

# Get the day(s) of the month
t1$mday

[1] 1

# Get the (numeric) month
t1$mon

[1] 1

# Get the (numeric) year
t1$year

[1] 120

# Get the (numeric) day of the week
t1$wday

[1] 6