How does Berlin Transport Validation Stamp mark current date and/or expiry date?

Question

Below is an image of my seven day unlimited travel ticket for Berlin B Section:

I have painted black on its printed serial number, and have circled the validation stamp impression in red.

I bought it on 11th Nov about 11am, from a ticket vending machine in Wedding S Station, for 30 Euros, and immediately validation stamped it to start using it. Now, I can calculate 7 days from 11th, inclusive, are till 17th, inclusive.

My question is where in validation stamp its mentioned that it was stamped on 11th Nov? What can I say to Ticket Inspector on 16th or 17th if he says its expired. (At Gesundbrunnen Metro Station the lady at info desk said its expired today, when I asked her same question, although we both struggled in German and English language. When I said I bought today, she said ok.)

So, could you please interpret the validation stamp, part by part, and/or ticket (or any other part), to prove that it is valid for 7 days.

Edit: One more sample of validation stamp I got, on different ticket, one time use, Eur 2.70, Date 10th Nov, Time somewhere 11:30ish AM, Berlin Airport TXL

Edit2: Ok,

1. Do means Donnerstag, Thursday. Fr means Freitag, Friday.
2. 11:40 is time in first ticket, 11:00 in second.
3. Looks like 45 is the week number of year 2016, from Nov 7 to 13.
4. What does 6 mean (rotated 90°, after 45)?

Answer 1

After the time-of-day on the stamp is a day-of-week in letters and a week number in numbers.

The 7-day ticket is stamped on Friday of week 45 in 2016.

The single ticket from Tegel is stamped on Thursday (in German: Donnerstag) of week 45 in 2016.

The stamp shows the date and time you validated the ticket, which is when the validity begins. The machines are not smart enough to know which kind of ticket you validate, but will put the same stamp on any piece of paper you stick into them.

If you hold on to your ticket for 10 years and they don't change the design in the meantime, you could ride on it once again ....

Answer 2

Note: I am adding my own observations as an answer, but would love to get a definitive explanation to the validation stamp contents.

As mentioned in my own edits,

1. Do and Fr means days of the week,
2. 45 is the week number (7th to 13th Nov)
3. 11:40 is time
4. Duration is printed just below stamp, 7-tag in first image, Ein....something in second, so 7 days and One (Journey?)

As detailed un below screenshot taken from BVG's website, week long ticket with end on 7th day Midnight.

Text of above Screenshot:

7-Day-Ticket

Travel as often as you want for seven consecutive calendar days.

The 7-Day-Ticket is valid for seven consecutive calendar days. Validity begins on the first day of the validity period printed on the ticket or from the time of validation and ends on the seventh calendar day, at midnight. For example, from validation at 9.30 a.m. on a Tuesday until midnight on the following Monday.

The Ticket is transferable and can also be used from other persons.