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How to Convert And Check Date With Different Format In Groovy?

3 minutes read

In Groovy, you can convert and check dates with different formats using the SimpleDateFormat class. To convert a date from one format to another, you can create two SimpleDateFormat objects - one for the input format and one for the output format. Then, you can parse the input date using the input format and format it using the output format. To check if a date is in a particular format, you can try parsing it with a SimpleDateFormat object that matches the format you are checking for. If the parsing is successful, then the date is in the expected format. If not, an exception will be thrown.


How to convert a timestamp to a date in Groovy?

You can convert a timestamp to a date in Groovy by using the Date class and formatting the timestamp with a desired date format. Here's an example code snippet that shows how to convert a timestamp to a date in Groovy:

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import java.util.Date
import java.text.SimpleDateFormat

def timestamp = 1623164273000 // Sample timestamp in milliseconds
def date = new Date(timestamp)

def dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
def formattedDate = dateFormat.format(date)

println formattedDate


In this code snippet, we first create a new Date object using the timestamp value. Then, we use a SimpleDateFormat object to format the date with the desired date format ("yyyy-MM-dd HH:mm:ss" in this case). Finally, we use the format method to convert the date to a formatted string, which can be printed or used as needed.


What is the Date class in Groovy?

In Groovy, the Date class represents a specific instant in time, with millisecond precision. It can be used to work with dates and times in a flexible and convenient way. The Date class in Groovy provides various methods for manipulating dates, formatting them, and converting them to different time zones. It is part of the java.util package and inherits many of its functionalities from the corresponding classes in Java.


What is the TimeZone class in Groovy?

The TimeZone class in Groovy is used to represent a specific time zone. It allows you to easily work with time zones in your Groovy scripts, such as converting times between different time zones, getting the offset of a particular time zone from UTC, and so on. The TimeZone class is part of the java.util package and provides a set of methods for working with time zones.


How to format a date with a custom pattern in Groovy?

In Groovy, you can use the SimpleDateFormat class to format a date with a custom pattern. Here's an example of how to format a date with a custom pattern in Groovy:

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import java.text.SimpleDateFormat
import java.util.Date

def date = new Date()
def pattern = "yyyy/MM/dd HH:mm:ss"

def dateFormat = new SimpleDateFormat(pattern)
def formattedDate = dateFormat.format(date)

println formattedDate


In this example, we first create a new Date object to represent the current date and time. We then define a custom pattern for formatting the date ("yyyy/MM/dd HH:mm:ss").


Next, we create a SimpleDateFormat object using the custom pattern, and use it to format the date object. Finally, we print the formatted date to the console.


You can customize the pattern to fit your specific requirements by referring to the SimpleDateFormat documentation for the available pattern letters and symbols.

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