How to convert Datetime to Unix timestamp in Groovy

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    // Convert Date to Unix timestamp
    Date date = new Date(122, 4, 15, 0, 56, 57) // 2022-05-15 00:56:57
    long unixTimestamp = date.getTime() / 1000
    
    println "Unix Timestamp: ${unixTimestamp}"

Output:

Unix Timestamp: 1652576217

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

Code Explanation

In this example of date to Unix timestamp conversion using Groovy, a Date object is created representing '2022-05-15 08:10:45'. In Groovy (and Java), the Date constructor uses a zero-based year and month, therefore, 122 represents the year 2022 (since it's the number of years since 1900) and 4 represents the month May (since it's zero-based, 0 = January, so 4 = May).
The getTime() method is called on the Date object, which returns the number of milliseconds since the Unix epoch.
Dividing this value by 1000 converts it to a Unix timestamp in seconds. The result is the Unix timestamp '1652576217', which is printed.

Convert Unix timestamp to Date 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