How to convert Unix timestamp to Datetime in Crystal

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    # Convert Unix timestamp to date
    unix_timestamp = 1652602245
    date_time = Time.unix(unix_timestamp)
    
    puts "Converted Date: #{date_time}"

Output:

Unix Timestamp: 1692835200

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

Code Explanation

Converting a unix timestamp to date can be achieved in Crystal using the Time.unix(unix_timestamp) function to convert the Unix timestamp '1652602245' into a Time object.
The result is a date and time corresponding to '2022-05-15 08:10:45 UTC'. Crystal's Time module makes it easy to work with time objects, and the conversion from Unix timestamp to a readable date is straightforward using the Time.unix method.

Convert Date to Unix timestamp in Crystal

Other useful Crystal date functions

Function	Description	Example
`Time.now`	Returns the current date and time based on the system's time zone.	`Time.now` returns 2024-08-28 12:34:56
`Time.unix()`	Creates a `Time` object from a Unix timestamp (seconds since January 1, 1970).	`Time.unix(1652602245)` returns 2022-05-15 08:10:45 UTC
`Time.new()`	Creates a `Time` object from specified year, month, day, hour, minute, and second.	`Time.new(2022, 5, 15, 8, 30, 45, Time::Location::UTC)` returns 2022-05-15 08:10:45 UTC
`#to_unix`	Returns the Unix timestamp (seconds since January 1, 1970) for the `Time` object.	`date_time.to_unix` returns 1652602245
`Time.parse()`	Parses a string into a `Time` object based on the provided format.	`Time.parse("2022-05-15 08:10:45", "%Y-%m-%d %H:%M:%S")` returns 2022-05-15 08:10:45 UTC
`Time.format()`	Formats a `Time` object as a string according to the provided format.	`date_time.format("%Y-%m-%d %H:%M:%S")` returns 2022-05-15 08:10:45
`Time.utc_now`	Returns the current UTC date and time.	`Time.utc_now` returns 2024-08-28 16:34:56 UTC
`Time::Span`	Represents a time span (duration), which can be added or subtracted from `Time` objects.	`time_span = Time::Span.new(5.days)` creates a time span of 5 days.

Current Unix Timestamp SECONDS SINCE JAN 01 1970

Current UTC Time

2025-08-21