180 Days Absence Calculation for ILR

I am on TIER 2 (GENERAL) VISA and looking for calculating the continuous period for being eligible to ILR through 5 years system.

Visa valid from date - 20/07/2019
UK entering date - 27/07/2019

Below are my trip details -

TRIP 1
Departed from UK - 17/01/2020
Returned to UK - 09/02/2020
No of days outside UK - 23

TRIP 2
Departed from UK - 04/07/2020
Returned to UK - 23/10/2020
No of days outside UK - 111

TRIP 3
Departed from UK - 15/11/2020
Returned to UK - 18/12/2020
No of days outside UK - 33

1. Above doc says "No more than 180 days’ absences are allowed in a consecutive 12-month period". In my case how do I calculate my absence days in consecutive 12 month period,
A. Is it from 27/07/2019 to 27/07/2020 as 1st year with 54(7+23+24) days of absence
B. And 2nd consecutive 12 month period starts from 28/07/2020 and ends on 28/07/2021 with 120(87+33) days of absence during 2nd year.

Can any one please let me know if my calculation stands right or please suggest.

The rolling baisis calculation means: No more than 180 days’ absences are allowed in ANY consecutive 12-month period
So in theory, if you choose any RANDOM date within the 5 year period and add 12 months to that date, that is your 12-month consecutive period and you should not have more than 180 days of absence in that period.

e.g. Let's choose a date: 02/07/2020.
Your consecutive period will be from that date to 01/07/2021. In this period you cannot have more than 180 days of absence. and so on ..