This comment was originally written by alexe.kaigorodov@gmail.com

sdk-dart acceptes new DateTime(275760), but rejects new DateTime(275761) with "Illegal argument" exception. Nothing is said of this restriction in the spec.

cc @lrhn.

The DateTime class currently provides the following documentation:
===
It can represent time values that are at a distance of at most 8,640,000,000,000,000ms (100,000,000 days) from epoch (1970-01-01 UTC). In other words: millisecondsSinceEpoch.abs() <= 8640000000000000.
===

We still need to specify how mixed-signed arguments are treated: new DateTime(275765, -12 * 6) is in the valid range, but in order to compute the range we are leaving the "safe" integer range (since these could overflow in JS).

Note that these values are timezone independent. A test that does new DateTime(MAX_YEAR, MAX_MONTH, ...) is therefore likely to be flaky depending on the timezone. new DateTime.utc(MAX_YEAR, ...) should, however, have consistent behavior across the VM and dart2js.

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