Add support for SOURCE_DATE_EPOCH #8
Description
I found it a little confusing trying to use this thing because it doesn't support reading the SOURCE_DATE_EPOCH environment variable.
It looks from the source code where the calling process's locale is used to parse the date argument, which is particularly non-convenient because the build is no longer independent of the caller's locale.
The code to do so looks something like this:
getDefaultValue: () => {
var sourcedatestr = Environment.GetEnvironmentVariable("SOURCE_DATE_EPOCH");
if (!string.IsNullOrEmpty(sourcedatestr))
return new DateTime(unixdt * TimeSpan.TicksPerSecond + new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).Ticks, DateTimeKind.Utc);
return DefaultDateTime;
}