round.POSIXt {base} | R Documentation

## Round / Truncate Data-Time Objects

### Description

Round or truncate date-time objects.

### Usage

    ## S3 method for class 'POSIXt':
    round(x, units=c("secs", "mins", "hours", "days"))
    ## S3 method for class 'POSIXt':
    trunc(x, units=c("secs", "mins", "hours", "days"))

    ## S3 method for class 'Date':
    round(x, ...)
    ## S3 method for class 'Date':
    trunc(x)

### Arguments

`x` | an object inheriting from `"POSIXt"` or `"Date"`.
`units` | one of the units listed. Can be abbreviated.
`...` | arguments to be passed to or from other methods, notably `digits`.

### Details

The time is rounded or truncated to the second, minute, hour or day. Timezones are only relevant to days, when midnight in the current timezone is used.

The methods for class `"Date"` are of little use except to remove fractional days.

### Value

An object of class `"POSIXlt"`.

### See Also

`round` for the generic function and default methods.

`DateTimeClasses`, `Date`

### Examples

    round(.leap.seconds + 1000, "hour")
    trunc(Sys.time(), "day")

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