seikyuubi o kakuninsuru.

I check the billing date.

Breakdown of seikyuubi o kakuninsuru.

• を: direct object particle
• 確認かくにんする: to check
• 請求日せいきゅうび: a billing date

Questions & Answers about seikyuubi o kakuninsuru.

How do you read 請求日を確認する?

It is read:

• 請求日 = せいきゅうび
• を = o (written wo, but pronounced o here)
• 確認する = かくにんする

So the whole sentence is:

せいきゅうび を かくにんする。

In natural writing, it would usually appear without spaces:

請求日を確認する。

What does 請求日 mean exactly?

請求日 usually means the billing date or invoice date.

Breakdown:

• 請求 = claim, demand, bill, invoice
• 日 = day / date

So 請求日 is the date associated with issuing a bill or invoice.

Depending on context, it is usually not the same as the payment due date. A due date would more often be something like:

• 支払日 = payment date
• 支払期限 = payment deadline

Why is を used here?