lossy conversion ?

readme.md

lossy conversion ?

Created with <3 with dartpad.dev.

main.dart

void main() {
  final past_ms = -150151152153154;
  final future_ms = 150151152153154;
  final past = DateTime.fromMicrosecondsSinceEpoch(past_ms, isUtc: true);
  print('$past (ms ${past.microsecondsSinceEpoch})');
  final future = DateTime.fromMicrosecondsSinceEpoch(future_ms, isUtc: true);
  print('$future (ms ${future.microsecondsSinceEpoch})');
}

output in dart console:

1965-03-30 03:20:47.847Z (ms -150151152153000)
1974-10-04 20:39:12.153Z (ms 150151152153000)

so reverse conversion in Rust is lossy ?
notice how the last part of the digit e.g. 154 in 150151152153154 or 150_151_152_153_154 is missing from DateTime microsecondsSinceEpoch.

On the other side, the equivalent in Rust:

1965-03-30 03:20:48.846846 UTC (ms -150151151153154)
1974-10-04 20:39:12.153154 UTC (ms 150151152153154)

Check Rust playground gist.

Well actually it gets weirder when comparing with different int sizes, see this another gist.

Tested on stable: Flutter 3.3.1 Dart 2.18.0.

update: conversion isn't lossy on platform other than web and DartPad.