How to convert Unix timestamp to Datetime in Groovy

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    // Convert Unix timestamp to Date
    long unixTimestamp = 899789882L
    Date date = new Date(unixTimestamp * 1000)
    
    println "Converted Date: ${date}"

Output:

Converted Date: 1998-07-07 05:38:02

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

Code Explanation

In this Groovy snippet, the Unix timestamp '899789882' is multiplied by 1000 to convert it from seconds to milliseconds (because the Java Date class uses milliseconds).
A new Date object is created using the Date constructor, which accepts the timestamp in milliseconds. The result is a Date object representing '1998-07-07 05:38:02', which is printed.

Convert Date to Unix timestamp in Groovy

Other useful Groovy date functions

Function	Description	Example
`new Date()`	Returns the current date and time as a `Date` object.	`new Date()` returns 2024-08-28 12:34:56
`new Date(long millis)`	Creates a `Date` object for the specified number of milliseconds since the Unix epoch.	`new Date(1652602245000L)` returns 2022-05-15 08:10:45
`getTime()`	Returns the number of milliseconds since the Unix epoch for a `Date` object.	`date.getTime()` returns 1652602245000L
`Date.parse()`	Parses a string representation of a date into a `Date` object using a specific format.	`Date.parse("yyyy-MM-dd", "2024-08-28")` returns 2024-08-28
`format()`	Formats a `Date` object as a string using a specified format.	`date.format("yyyy-MM-dd HH:mm:ss")` returns 2022-05-15 08:10:45
`clearTime()`	Clears the time portion of a `Date` object, leaving only the date.	`date.clearTime()` sets the time to 00:00:00.
`plus()`	Adds a number of days to a `Date` object.	`date.plus(5)` adds 5 days to the date.
`minus()`	Subtracts a number of days from a `Date` object.	`date.minus(3)` subtracts 3 days from the date.
`use(TimeCategory)`	Adds or subtracts time units such as hours, minutes, and seconds in a human-readable way.	`use(TimeCategory) { date + 5.hours }` adds 5 hours to the date.
`Calendar.getInstance()`	Returns a `Calendar` object representing the current date and time.	`Calendar.getInstance()` returns the current date and time as a `Calendar` object.

Current Unix Timestamp SECONDS SINCE JAN 01 1970

Current UTC Time

2025-08-20