Tier 2 to ilr late joining date

[Smn1118]

Hi
I am the main applicant and have been on tier 2 since 18 feb 2015
I was out of country on maternity from 24th September 2018 to 20th March 2019 (177days)
How are the 180 day rule calculated
My first extension was on 18th June 2018
I am due for my ilr on 18th Feb 2020

Any help would be truly appreciated

[Smn1118]

Hi
I am really stressed out at the moment
Hoping to get some help here
I am applying for ilr in couple of weeks but have a fed questions
1) I was assigned a cos with joining date 19th jan 2015
Visa approved on 18th Feb 2015
Entry clearance 18th march 2015
Due to medical reasons actual joining date deferd to 5th may 2015
My question is will this effect my ilr on the bases of not joining the company for that one and half month
Regards

[Smn1118]

Can someone please reply