#shimmmaz_api
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peak valve
Hello! There's a one month + one hour difference between the backdate_start_date and billing_cycle_anchor timestamps you're setting. Is that additional hour intentional? That might be causing the issue.
strong oyster
that one hour is probably due to day light savings, and probably has nothing to do with my setup
peak valve
Yeah, the timestamp you're providing is the issue. The period you end up billing for represents 1.0013440860215055 of a full period, which is where those extra cents are coming from. If you want it to be exactly one period's worth of charges you need to specify timestamps that represent exactly 1 period.
strong oyster
Got it, interestingly, I just retried with 1 hour extra and it worked
Thank you for the help!
peak valve
I think it probably does have something to do with daylight saving and how a specific period is being calculated.
Internally, for the Subscription associated with the Event you shared above, we're calculating it based on 2024-11-30 22:00:00 - 2024-10-31 21:00:00 which has an extra hour in there.
That's 1.0013440860215055 of a period, so we multiply that by the amount for a period, which comes out to the amount for a period plus some cents.
strong oyster
yep, that all makes sense.
A related but different question: When a subscription starts on the 1st of the month, when does it actually start? 12 am UTC? Some other time?
peak valve
It depends on exactly how it was created. Can you give me the request ID showing an example Subscription creation? Here's how you can find a request ID: https://support.stripe.com/questions/finding-the-id-for-an-api-request
strong oyster
I can see that in my setup every subscription that gets charged on the 1st of the month is charged on a slightly different time. I was wondering if there was a stripe time that subscription are charged for.
peak valve
The actual payments happen at slightly different times from the exact period specified in the Subscription because they're queued and processed alongside other recurring transactions Stripe-wide.
The calculations for how much to charge are based on the Subscription period values, but the actual payments happen typically a bit later than that due to the queue.