ResQ.Protocols.ProtocolExtensions.FromUnixMs(thislong)

public static System.DateTimeOffset FromUnixMs(this long timestampMs);

// From a protobuf timestamp field
long timestampMs = 1704067200000; // 2024-01-01 00:00:00 UTC
var dateTime = timestampMs.FromUnixMs();
Console.WriteLine(dateTime); // 2024-01-01 00:00:00 +00:00

// From current time
var now = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds().FromUnixMs();