[bugfix] Parse `scheduled_at` as ISO8601 with offset if RFC3339 parse fails (#4431)

# Description

> If this is a code change, please include a summary of what you've coded, and link to the issue(s) it closes/implements.
>
> If this is a documentation change, please briefly describe what you've changed and why.

Closes https://codeberg.org/superseriousbusiness/gotosocial/issues/4409 by reattempting `scheduled_at` parsing using ISO8601 offset.

## Checklist

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If this is a documentation change, only the first checkbox must be filled (you can delete the others if you want).

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [x] I/we have commented the added code, particularly in hard-to-understand areas.
- [x] I/we have made any necessary changes to documentation.
- [x] I/we have added tests that cover new code.
- [x] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4431
Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Co-committed-by: tobi <tobi.smethurst@protonmail.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/internal/api/model/status.go b/internal/api/model/status.go
index 3edb4be5f..3ce5913bd 100644
--- a/internal/api/model/status.go
+++ b/internal/api/model/status.go
@@ -248,14 +248,18 @@ type StatusCreateRequest struct {
 	// Deprecated: Only used if LocalOnly is not set.
 	Federated *bool `form:"federated" json:"federated"`
 
-	// ISO 8601 Datetime at which to schedule a status.
+	// ISO8601 datetime string at which to schedule a status.
 	//
-	// Providing this parameter with a *future* time will cause ScheduledStatus to be returned instead of Status.
-	// Must be at least 5 minutes in the future.
+	// Providing this parameter with a *future* time will cause ScheduledStatus
+	// to be returned instead of Status (must be at least 5 minutes in the future).
 	//
 	// Providing this parameter with a *past* time will cause the status to be backdated,
 	// and will not push it to the user's followers. This is intended for importing old statuses.
-	ScheduledAt *time.Time `form:"scheduled_at" json:"scheduled_at"`
+	ScheduledAtRaw string `form:"scheduled_at" json:"scheduled_at"`
+
+	// ScheduledAtParsed is the parsed version
+	// of scheduled_at, if scheduled_at was set.
+	ScheduledAt *time.Time `form:"-" json:"-"`
 
 	// ISO 639 language code for this status.
 	Language string `form:"language" json:"language"`