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Roms1383/main.dart

Last active September 10, 2022 16:35
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lossy conversion ?
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readme.md
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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})');
}
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Roms1383 commented Sep 10, 2022 •
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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.

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Roms1383 commented Sep 10, 2022

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.

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Roms1383 commented Sep 10, 2022

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

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Roms1383 commented Sep 10, 2022

Tested on stable: Flutter 3.3.1 Dart 2.18.0.

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Roms1383 commented Sep 10, 2022

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

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