millisecondsSinceEpoch property
int millisecondsSinceEpochThe number of milliseconds since the "Unix epoch" 1970-01-01T00:00:00Z (UTC).
This value is independent of the time zone.
This value is at most 8,640,000,000,000,000ms (100,000,000 days) from the Unix epoch. In other words: millisecondsSinceEpoch.abs() <= 8640000000000000
.
Source
external int get millisecondsSinceEpoch;
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https://api.dartlang.org/stable/1.24.3/dart-core/DateTime/millisecondsSinceEpoch.html