How to convert Unix timestamp to Datetime in Erlang

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    % Convert Unix timestamp to DateTime
    UnixTimestamp = 1122242312,
    DateTime = calendar:unix_time_to_datetime(UnixTimestamp),
    io:format("Converted Date: ~p~n", [DateTime]).

Output:

Converted Date: 2005-07-24 21:58:32

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

Code Explanation

In this Erlang snippet, the Unix timestamp '1122242312' is passed to the calendar:unix_time_to_datetime() function. This function converts the Unix timestamp to a datetime tuple of the form {{Year, Month, Day}, {Hour, Minute, Second}}.
For this Unix timestamp, the result is {{2005, 7, 24}, {21, 58, 32}}, which represents the date '2005-07-24 21:58:32'.

Convert Date to Unix timestamp in Erlang

Other useful Erlang date functions

Function	Description	Example
`calendar:local_time()`	Returns the current local date and time as a tuple.	`calendar:local_time()` returns {{2024, 8, 28}, {12, 34, 56}}
`calendar:universal_time()`	Returns the current UTC date and time as a tuple.	`calendar:universal_time()` returns {{2024, 8, 28}, {16, 34, 56}}
`calendar:datetime_to_unix()`	Converts a `datetime` tuple to a Unix timestamp.	`calendar:datetime_to_unix({{2022, 5, 15}, {8, 30, 45}})` returns 1652602245
`calendar:unix_time_to_datetime()`	Converts a Unix timestamp to a `datetime` tuple.	`calendar:unix_time_to_datetime(1652602245)` returns {{2022, 5, 15}, {8, 30, 45}}
`calendar:date_to_gregorian_days()`	Converts a date tuple to the number of days since year 0 in the Gregorian calendar.	`calendar:date_to_gregorian_days({2022, 5, 15})` returns 738187
`calendar:gregorian_days_to_date()`	Converts the number of days since year 0 in the Gregorian calendar to a date tuple.	`calendar:gregorian_days_to_date(738187)` returns {2022, 5, 15}
`calendar:now_to_universal_time()`	Converts the current time to UTC as a `datetime` tuple.	`calendar:now_to_universal_time()` returns the current UTC date and time.
`calendar:time_to_seconds()`	Converts a time tuple to the number of seconds since midnight.	`calendar:time_to_seconds({8, 30, 45})` returns 30645 seconds
`calendar:seconds_to_time()`	Converts a number of seconds since midnight to a time tuple.	`calendar:seconds_to_time(30645)` returns {8, 30, 45}

Current Unix Timestamp SECONDS SINCE JAN 01 1970

Current UTC Time

2025-08-20