When exactly do steam sales end?

[DaAinGame]

I'm looking at the 50% off HellDivers right now, and it's a week long deal that ends March 10th. I also get paid March 10th, and am curious if that means the sale ends as soon as the steam servers roll over to March 15th, or if that means when the steam servers roll over onto March 16th the sale ends. And on that note, what timezone does steam run off of?

Thanks guys!

[cSg|mc-Hotsauce]

10am pacific time

[Seretti]

Sales end/start at 10 AM PST

[HEART]

Weeklong deals are normally refreshed on Monday.

Timezone for Steam/Valve is Pacific Standard Time (PST)