Good English is very important there's nothing like"how was your day" is either you say "how was your day" or rather say " how was your day" the" How" is supposed to come before"Was" Then followed by"Day" so stop saying "How was your day" and start saying"How was your day".... Thank you for your understanding
Don't say ,thank you for your understanding either say , thank you for your understanding, that's great advice,so thank you for your understanding.