[API] Oncall daily shifts on timezones != UTC don't work

[afreyermuth98]

What went wrong?

What happened:
I tried to configure oncall daily shifts using the API (terraform) on Europe timezone and the 2 users have a shift every day : USER1 & USER2 on monday, USER1 & USER2 on tuesday etc ...

What did you expect to happen:
Each of the user have a shift rotation, USER1 on monday, USER2 on tuesday, USER1 on wednesday etc ...

How do we reproduce it?

On my side I did it with Terraform :

resource "grafana_oncall_schedule" "schedule" {
  provider         = grafana.oncall
  name             = "my schedule"
  type             = "calendar"
  time_zone        = "Europe/Paris"
  team_id          = data.grafana_oncall_team.team.id # To refer
  shifts = [
    grafana_oncall_on_call_shift.shift.id
  ]
  slack {
    channel_id    = data.grafana_oncall_slack_channel.grafana_oncall_slack_channel.id
    user_group_id = data.grafana_oncall_user_group.slack_user_group.i
  }
}

resource "grafana_oncall_on_call_shift" "shift" {
  provider      = grafana.oncall
  name          = "test shift"
  type          = "rolling_users"
  start         = "2024-01-01T08:00:00"
  duration      = 60 * 60 * 10 # 10 hours
  frequency     = "daily"
  interval      = 1
  by_day        = ["MO", "TU", "WE", "TH", "FR"]
  week_start    = "MO"
  rolling_users = [
    [
      "USER_1"
    ],
    [
      "USER_2"
    ]
  ],
  time_zone     = "Europe/Paris"
}

You can reproduce the same with the API

Grafana OnCall Version

1.3.102

Product Area

Schedules

Grafana OnCall Platform?

Kubernetes

User's Browser?

No response

Anything else to add?

No response