DateTime’s representation in milliseconds?

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You’re probably trying to convert to a UNIX-like timestamp, which are in UTC:

yourDateTime.ToUniversalTime().Subtract(
    new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)
    ).TotalMilliseconds

This also avoids summertime issues, since UTC doesn’t have those.

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