Get Last Month Date In Flutter / Dart

Question

in flutter we can get current month using this

var now = new DateTime.now();
var formatter = new DateFormat('MM');
String month = formatter.format(now);

But how to get the last month date? Especially if current date is January (01). we can't get the right month when we use operand minus (-) , like month - 1.

Answer 1

You can just use

var prevMonth = new DateTime(date.year, date.month - 1, date.day);

with

var date = new DateTime(2018, 1, 13);

you get

2017-12-13

It's usually a good idea to convert to UTC and then back to local date/time before doing date calculations to avoid issues with daylight saving and time zones.