TimeStamp from DateTime not working

When creating the TimeStamp from DateTime the code takes total ticks. As stated in definition there are 10,000 ticks in a millisecond (see [TicksPerMillisecond](https://learn.microsoft.com/en-us/dotnet/api/system.timespan.tickspermillisecond?view=net-8.0)) and 10 million ticks in a second. To redis it supplied just calling ToString() method but redis expects the timestamp in miliseconds.