My married visa expire on 22 october, can I renew 15 days before expire date?

Yes I believe you can renew up to 30 days early.

Yes you can.

• You can apply within the last 30 days. Some offices as much as 45 days.
• The new extension applies form the date the old extension expires so you do not lose out anything by applying early.

I see, because samutprakan officer said before last 30 days, I just want to make sure before 15 days is fine.

<p>Yes you can.

• You can apply within the last 30 days. Some offices as much as 45 days.
• The new extension applies form the date the old extension expires so you do not lose out anything by applying early.

"I see, because samutprakan officer said before last 30 days, I just want to make sure before 15 days is fine."

There may have been some language confusion. The officer probably said 'during' the last 30 days, not 'before'.