How to convert Unix timestamp to Date in R

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    unix_timestamp <- 1389818300
    date <- as.POSIXct(unix_timestamp, origin="1970-01-01", tz="UTC")
    print(date)

Output:

2014-01-15 20:38:20

Example only. There may be multiple ways to perform this operation.

Code Explanation

In this R example, the Unix timestamp 1389818300 is converted to a date using the as.POSIXct() function, specifying "1970-01-01" as the origin (the Unix epoch) and "UTC" as the time zone. This conversion gives you the corresponding date and time.
In this example, the output is 2014-01-15 20:38:20.

Convert Date to Unix timestamp in R

Other useful R date functions

Function	Description	Example
`Sys.Date()`	Returns the current date.	`Sys.Date()` returns 2024-08-28
`Sys.time()`	Returns the current date and time as a POSIXct object.	`Sys.time()` returns 2024-08-28 12:34:56
`as.Date()`	Converts a character string to a Date object.	`as.Date('2024-08-28')` returns 2024-08-28
`as.POSIXct()`	Converts a date-time string or object to a POSIXct object, which represents the date and time in seconds since the Unix epoch.	`as.POSIXct('2024-08-28 12:34:56')` returns 2024-08-28 12:34:56
`as.POSIXlt()`	Converts a date-time string or object to a POSIXlt object, which stores date-time components as a list.	`as.POSIXlt('2024-08-28 12:34:56')` returns a list with date-time components.
`format()`	Formats a date or date-time object according to a specified format string.	`format(Sys.Date(), '%Y-%m-%d')` returns 2024-08-28
`difftime()`	Calculates the difference between two dates or date-time objects.	`difftime(Sys.time(), as.POSIXct('2024-08-28 12:00:00'))` returns 0.5 hours
`strptime()`	Parses a date-time string according to a specified format and returns a POSIXlt object.	`strptime('2024-08-28 12:34:56', '%Y-%m-%d %H:%M:%S')` returns a POSIXlt object.
`seq.Date()`	Generates a sequence of dates.	`seq.Date(from=as.Date('2024-08-28'), by='1 day', length.out=3)` returns 2024-08-28, 2024-08-29, 2024-08-30
`julian()`	Calculates the Julian date (days since origin) for a Date or POSIXct object.	`julian(as.Date('2024-08-28'))` returns 20143 days since origin.

Current Unix Timestamp SECONDS SINCE JAN 01 1970

Current UTC Time

2025-08-20