The day of departure counts. As long as you board the night train before midnight, it only counts as one day. Per your itinerary 5 days might be enough but it depends on how you do Copenhagen - Frankfurt : if you leave at 23:55, you’ll need 2 pass days. Otherwise buy a regular ticket until Valby (the first stop). From there use the pass as the train leaves at midnight. I’d recommend a 7-day pass or a 5-day pass and you book Copenhagen - Malmö separately.

Night trains are extremely popular and some dates are already sold out. Remember that you need to add about 30€ for a couchette.

• Verona - Munich 15.07 : only seats available (not recommended) → 13,70€
• Munich - Berlin 16.07 : only ICE trains on this route → optional reservation, normal seat on a fully lit carriage
• board at Hamburg-Altona at 23:58 (instead of changing at Neumünster) → normal seat on a fully lit carriage, 5€ reservation
• Is Copenhagen - Odense - Hamburg - Frankfurt your itinerary ? This is not possible as Odense - Hamburg Hbf is sold out. Solution : Copenhagen - Hamburg-Altona (seat) and from there to Frankfurt

Your itinerary looks a bit ambitious to me but it certainly is doable. You won’t get much sleep at any point during your trip. I’d skip Frankfurt if you don’t have a specific reason to go there. A good option to Copenhagen (2 pass days) :

• EC Verona - Innsbruck 15:01 - 18:36 (or earlier) 10€ Brenner Pass surcharge (no surcharge if you take regional trains)
• Nightjet Innsbruck - Hannover 20:12 - 06:49 14€ seat, 34€ couchette, 74€ sleeper
• ICE Hannover - Hamburg-Harburg 08:36 - 09:41
• S-Bahn to Altona (due to engineering works no ICE trains run)
• IC Hamburg-Altona - Copenhagen 10:58 - 15:44 5€ seat reservation

On the way back you could take the night train to Berlin (snalltaget.se), either from Malmö or Copenhagen (suburbs)  :

• Malmö C 22:25 or Copenhagen Oerestad - Berlin Hbf 23:07 - 08:47 18€ seat, 44€ couchette

Let me know for questions

Hi, thank you for your answer! 

I checked your suggestion on interrail schedule table, but I can't found these route:

• Nightjet Innsbruck - Hannover 20:12 - 06:49 14€ seat, 34€ couchette, 74€ sleeper
• Malmö C 22:25 or Copenhagen Oerestad - Berlin Hbf 23:07 - 08:47 18€ seat, 44€ couchette

And, why do you already know that the train Odense - Hamburg Hbf is sold out, if I can see it on interrail website and I will on July?? 

Thanks! 

I use the companies websites. Interrail doesn't show availability until you've bought a pass. It is not the best place to book either as they add a 2€ booking fee per person per train + are sometimes more expensive. Rail Planner isn't reliable either, it's best to use bahn.com or the companies websites.

Innsbruck - Hannover : nightjet.com or tickets.oebb.at (add Interrail as a discount and select one-way tickets)

Malmö - "Copenhagen" - Hamburg - Berlin : snalltaget.se or sj.se

General advice :

https://community.eurail.com/train-connections-reservations-47/how-to-get-reservations-105

https://www.seat61.com/interrail-and-eurail-reservations.htm

Your information is very useful! 

What do you think, exclusively that it's a little bit ambitious, about this intinerante? ( I checked every single connections on company trains website) 

1. First day - first interrail ticket

Verona - Innsbruck 15/07/23 15.01-18.36 (OBB) 

Visit Innsbruck 15/07

Innsbruck - Hannover HBF 15/07/23 20.12-06.49 (+1 day) (OBB) 

2. Second day - Second interrail ticket

Walk in Hannover 16/07

Hannover HBF - Hamburg HBF 16/07/23 09.20-10.36 (DB) 

Visit Hamburg 16/07

Hamburg-Altona - Copenhagen 16/07/23 23.58-06.58 (+1 day) (DB) 

3. Third day and fourth day - third interrail ticket

Visit Copenhagen 17/07

Night of 17/07/23 in Copenhagen

Copenhagen - Malmo go and return in the same day 18/07/23 (Visit Malmo) (DSB) 

Night of 18/07/23 in Copenhagen

4. Fiveth day - fourth interrail ticket

Visit Copenhagen 19/07

Copenhagen - Berlin HBF 19/07/23 23.07-08.47 (+1 day) (snalltaget) 

5. Sixth day - fiveth interrail ticket

Visit Berlin 20/07

Berlin HBF - Munich HBF 20/07/23 21.26-07.28 (+1 day) (DB) 

6. Seventh day - sixth interrail ticket (I use ticket if I go tu Dachau) 

Visit Munich 21/07 and unot confirmed: Munich - Dachau go and return in the same day 21/07/23 (Visit Dachau in half day)] (DB) 

Night of 21/07/23 in Munich

7. Eighth day - seventh interrail ticket

Munich - Verona 22/07/24 13.34-18.58 (OBB) 

Now, do I count correctly days of interrail ticket? I did understand correctly if I take some trans in a day e in the evening I take a night train that departure before 23.59 and it arrive the next day in the new destination?? 

Yes you counted right. Exactly, as long as you board the last train before midnight, it counts as one travel day.

Only remember to book the Nightjet to Hannover and Snalltaget ASAP (seat or couchette) and some other trains a few weeks before departure (most will be busy so you might have to stand for a while).

• 2 x 10€ Brennerpass surcharge (+ 3€ seat reservation, very recommended) for Verona - Innsbruck and Munich - Verona tickets.oebb.at → add Interrail as a discount and select one-way tickets
• 3€ Hannover - Hamburg tickets.oebb.at
• 30 DKK Hamburg - Copenhagen https://travel.b-europe.com/dsb-rail/en/reservation-only#TravelWish
• 3€ Berlin - Munich tickets.oebb.at (maybe not necessary)

Enjoy your trip !