Converting timestamp in specific format in Dart

format_utc_date.dart

/*
Many a times we receive timestamp from an api which is in this format -> 2020-04-08T12:20:40.000Z. We ofcourse can't use 
this date as is in the UI. Hence, we first need to convert it into a readable or specific format.
*/

// Notice the `T` in the given date. It acts as a separator between `date` and `time` and doesn't hold any significance. Hence we will separate the given date using `substring()` method as below:

var str = "2020-04-08T12:20:40.000Z";
var newStr = str.substring(0,10) + ' ' + str.substring(11,23);
print(newStr);  // 2020-04-08 12:20:40.000

// The last letter in the given date, `Z` indicates UTC or `Zero` timezone offset by 0 from UTC. We will leave out that letter using `substring()` as shown above.

// Convert String into DateTime object
DateTime dt = DateTime.parse(newStr);

// Specify the format in which we want the DateTime object need to be converted and then format it.
print(DateFormat("EEE, d MMM yyyy HH:mm:ss").format(dt));  // Wed, 8 Apr 2020 12:20:40

/* Final output:

Date to convert : 2020-04-08T12:20:40.000Z
Specified format: EEE, d MMM yyyy HH:mm:ss
Result          : Wed, 8 Apr 2020 12:20:40
*/

// Originally posted as an answer on StackOverflow question: https://stackoverflow.com/questions/61069464/how-to-format-this-date-2019-04-05t140051-000z-in-flutter/61074152#61074152