I am trying to decode the date-time receiving from my APIs in my required format "yyyy-MM-dd"

I receive time in 2 format

1. "2022-05-05T11:32:12.542Z"
2. "2022-05-06T07:33:46.59928 00:00"

I am able to decode first format by parsing it using following pattern

"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"

but not able to understand the format for the 2nd condition.

Some more example example of 2nd Condition

"2022-05-06T06:30:25.583988 00:00"
"2022-05-05T11:32:49.393283 00:00"

P.S. I don't required parsing logic only needed the pattern

Full method used in the code for parsing 1st Condition

fun convertToFormat(src: String): String {
    
    val originalFormat =
        SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.getDefault())
    val targetFormat = SimpleDateFormat("yyyy-MM-dd")
    val date = originalFormat.parse(src)
    return targetFormat.format(date)
}

CodePudding user response：

tl;dr

If you only want to just pull the date portion of the input string, split.

"2022-05-05T11:32:12.542Z"
.split( "T" ) 
[ 0 ] 

If you want to parse the input string, use OffsetDateTime & LocalDate.

OffsetDateTime
.parse(
    input 
) 
.toLocalDate()
.toString() ;

Avoid legacy classes

You are using terrible date-time classes that were years ago supplanted by the modern java.time classes defined by JSR 310. Never use SimpleDateFormat, Date, Calendar.

ISO 8601

Both of your exemple strings represent a moment as seen with an offset from UTC of zero hours-minutes-seconds.

Both of your example strings are in standard ISO 8601 format. The java.time classes support ISO 8601 formats by default when parsing/generating text. So no need to specify a formatting pattern.

Instant

Parse your input as objects of class Instant.

Instant instant1 = Instant.parse( "2022-05-05T11:32:12.542Z" ) ;
Instant instant2 = Instant.parse( "2022-05-06T07:33:46.59928 00:00" ) ;

See this code run live at IdeOne.com.

LocalDate

You want date only. So convert to the more flexible OffsetDateTime, and extract LocalDate.

LocalDate ld = Instant.atOffset( ZoneOffset.UTC ).toLocalDate() ; 

Then call LocalDate#toString to generate text in ISO 8601 format YYYY-MM-DD.

Android

The java.time classes are built into Java 8 and later.

Android 26 carries an implementation of java.time. For earlier Android, the latest tooling provides most of the functionality via “API desugaring”.

CodePudding user response：

I was looking the SimpleDateFormat Docs, and found this reference: https://developer.android.com/reference/kotlin/java/text/SimpleDateFormat#examples

The pattern "yyyy-MM-dd'T'HH:mm:ss.SSSXXX" 2001-07-04T12:08:56.235-07:00, looks like very similar with this you are receiving (except about the seconds precision).