feat(datetime): resolve datetime TODOs

Introduce shim functions and constants, replacing the ad-hoc chrono
format strings and parse helpers used as phase-b placeholders.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

11 files changed, 99 insertions, 69 deletions

diff --git a/crates/shirabe/src/repository/vcs/forgejo_driver.rs b/crates/shirabe/src/repository/vcs/forgejo_driver.rs
index a40f6a9..73975cd 100644
--- a/crates/shirabe/src/repository/vcs/forgejo_driver.rs
+++ b/crates/shirabe/src/repository/vcs/forgejo_driver.rs
@@ -5,7 +5,7 @@ use anyhow::Result;
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::{CaptureKey, Preg};
 use shirabe_php_shim::{
-    PhpMixed, RuntimeException, base64_decode, explode, extension_loaded, urlencode,
+    DATE_RFC3339, PhpMixed, RuntimeException, base64_decode, explode, extension_loaded, urlencode,
 };
 
 use crate::cache::Cache;
@@ -185,7 +185,7 @@ impl ForgejoDriver {
     pub fn get_change_date(
         &mut self,
         identifier: &str,
-    ) -> Result<Option<chrono::DateTime<chrono::Utc>>> {
+    ) -> Result<Option<chrono::DateTime<chrono::FixedOffset>>> {
         if let Some(ref mut git_driver) = self.git_driver {
             return git_driver.get_change_date(identifier);
         }
@@ -218,8 +218,7 @@ impl ForgejoDriver {
             code: 0,
         })?;
 
-        let date = chrono::DateTime::parse_from_rfc3339(&date_str)
-            .map(|d| d.with_timezone(&chrono::Utc))?;
+        let date: chrono::DateTime<chrono::FixedOffset> = shirabe_php_shim::date_create(&date_str)?;
         Ok(Some(date))
     }
 
@@ -725,7 +724,7 @@ impl crate::repository::vcs::VcsDriverInterface for ForgejoDriver {
     fn get_change_date(
         &mut self,
         identifier: &str,
-    ) -> anyhow::Result<Option<chrono::DateTime<chrono::Utc>>> {
+    ) -> anyhow::Result<Option<chrono::DateTime<chrono::FixedOffset>>> {
         ForgejoDriver::get_change_date(self, identifier)
     }
 
diff --git a/crates/shirabe/src/repository/vcs/fossil_driver.rs b/crates/shirabe/src/repository/vcs/fossil_driver.rs
index 0ee20da..15328c0 100644
--- a/crates/shirabe/src/repository/vcs/fossil_driver.rs
+++ b/crates/shirabe/src/repository/vcs/fossil_driver.rs
@@ -1,10 +1,12 @@
 //! ref: composer/src/Composer/Repository/Vcs/FossilDriver.php
 
 use crate::io::io_interface;
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, FixedOffset, Utc};
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::Preg;
-use shirabe_php_shim::{PhpMixed, RuntimeException, dirname, is_dir, is_file, is_writable};
+use shirabe_php_shim::{
+    DATE_RFC3339, PhpMixed, RuntimeException, dirname, is_dir, is_file, is_writable,
+};
 
 use crate::cache::Cache;
 use crate::config::Config;
@@ -256,7 +258,10 @@ impl FossilDriver {
         Ok(Some(content))
     }
 
-    pub fn get_change_date(&self, _identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    pub fn get_change_date(
+        &self,
+        _identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         let mut output = String::new();
         self.inner.process.borrow_mut().execute_args(
             &["fossil", "finfo", "-b", "-n", "1", "composer.json"]
@@ -268,8 +273,8 @@ impl FossilDriver {
         let parts: Vec<&str> = output.trim().splitn(3, ' ').collect();
         let date = parts.get(1).copied().unwrap_or("");
 
-        let date = DateTime::parse_from_rfc3339(date).map(|d| d.with_timezone(&Utc))?;
-        Ok(Some(date))
+        let date: DateTime<Utc> = shirabe_php_shim::date_create(date)?;
+        Ok(Some(date.fixed_offset()))
     }
 
     pub fn get_tags(&mut self) -> anyhow::Result<IndexMap<String, String>> {
@@ -383,7 +388,10 @@ impl crate::repository::vcs::VcsDriverInterface for FossilDriver {
         FossilDriver::get_file_content(self, file, identifier)
     }
 
-    fn get_change_date(&mut self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    fn get_change_date(
+        &mut self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         FossilDriver::get_change_date(self, identifier)
     }
 
diff --git a/crates/shirabe/src/repository/vcs/git_bitbucket_driver.rs b/crates/shirabe/src/repository/vcs/git_bitbucket_driver.rs
index f8cfd7a..de1f814 100644
--- a/crates/shirabe/src/repository/vcs/git_bitbucket_driver.rs
+++ b/crates/shirabe/src/repository/vcs/git_bitbucket_driver.rs
@@ -2,13 +2,13 @@
 
 use crate::io::io_interface;
 use anyhow::Result;
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, FixedOffset};
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::{CaptureKey, Preg};
 use shirabe_php_shim::{
-    InvalidArgumentException, LogicException, PhpMixed, RuntimeException, array_key_exists,
-    array_search_mixed, extension_loaded, http_build_query_mixed, implode, in_array, is_array,
-    sprintf, strpos,
+    DATE_RFC3339, InvalidArgumentException, LogicException, PhpMixed, RuntimeException,
+    array_key_exists, array_search_mixed, extension_loaded, http_build_query_mixed, implode,
+    in_array, is_array, sprintf, strpos,
 };
 
 use crate::cache::Cache;
@@ -461,7 +461,7 @@ impl GitBitbucketDriver {
     }
 
     /// @inheritDoc
-    pub fn get_change_date(&mut self, identifier: &str) -> Result<Option<DateTime<Utc>>> {
+    pub fn get_change_date(&mut self, identifier: &str) -> Result<Option<DateTime<FixedOffset>>> {
         if let Some(fallback) = self.fallback_driver.as_mut() {
             return fallback.get_change_date(identifier);
         }
@@ -486,11 +486,8 @@ impl GitBitbucketDriver {
             .fetch_with_oauth_credentials(&resource, false)?
             .decode_json()?;
 
-        // TODO(phase-b): port PHP `new \DateTimeImmutable($commit['date'])`
         let date_str = commit.get("date").and_then(|v| v.as_string()).unwrap_or("");
-        let date: DateTime<Utc> = chrono::DateTime::parse_from_rfc3339(date_str)
-            .map_err(|e| anyhow::anyhow!(e))?
-            .with_timezone(&Utc);
+        let date: DateTime<FixedOffset> = shirabe_php_shim::date_create(date_str)?;
         Ok(Some(date))
     }
 
@@ -920,7 +917,10 @@ impl crate::repository::vcs::VcsDriverInterface for GitBitbucketDriver {
         GitBitbucketDriver::get_file_content(self, file, identifier)
     }
 
-    fn get_change_date(&mut self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    fn get_change_date(
+        &mut self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         GitBitbucketDriver::get_change_date(self, identifier)
     }
 
diff --git a/crates/shirabe/src/repository/vcs/git_driver.rs b/crates/shirabe/src/repository/vcs/git_driver.rs
index 4878ffe..7f8c206 100644
--- a/crates/shirabe/src/repository/vcs/git_driver.rs
+++ b/crates/shirabe/src/repository/vcs/git_driver.rs
@@ -2,7 +2,7 @@
 
 use crate::io::io_interface;
 use chrono::TimeZone;
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, FixedOffset, Utc};
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::{CaptureKey, Preg};
 use shirabe_php_shim::{
@@ -281,7 +281,10 @@ impl GitDriver {
         Ok(Some(content))
     }
 
-    pub fn get_change_date(&mut self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    pub fn get_change_date(
+        &mut self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         if identifier.starts_with('-') {
             return Err(RuntimeException {
                 message: format!(
@@ -310,7 +313,9 @@ impl GitDriver {
 
         let timestamp_str = GitUtil::parse_rev_list_output(&output, &self.inner.process);
         let timestamp: i64 = timestamp_str.trim().parse().unwrap_or(0);
-        Ok(Some(Utc.timestamp_opt(timestamp, 0).unwrap()))
+        Ok(Some(
+            Utc.timestamp_opt(timestamp, 0).unwrap().fixed_offset(),
+        ))
     }
 
     pub fn get_tags(&mut self) -> anyhow::Result<IndexMap<String, String>> {
@@ -514,7 +519,10 @@ impl crate::repository::vcs::VcsDriverInterface for GitDriver {
         GitDriver::get_file_content(self, file, identifier)
     }
 
-    fn get_change_date(&mut self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    fn get_change_date(
+        &mut self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         GitDriver::get_change_date(self, identifier)
     }
 
diff --git a/crates/shirabe/src/repository/vcs/github_driver.rs b/crates/shirabe/src/repository/vcs/github_driver.rs
index 45ba7b7..aa1e135 100644
--- a/crates/shirabe/src/repository/vcs/github_driver.rs
+++ b/crates/shirabe/src/repository/vcs/github_driver.rs
@@ -2,13 +2,14 @@
 
 use crate::io::io_interface;
 use anyhow::Result;
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, FixedOffset};
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::{CaptureKey, Preg};
 use shirabe_php_shim::{
-    InvalidArgumentException, PhpMixed, RuntimeException, array_diff, array_key_exists, array_map,
-    array_search_mixed, base64_decode, basename, count, empty, explode, extension_loaded, in_array,
-    parse_url_all, sprintf, strpos, strtolower, substr, trim, urlencode,
+    DATE_RFC3339, InvalidArgumentException, PhpMixed, RuntimeException, array_diff,
+    array_key_exists, array_map, array_search_mixed, base64_decode, basename, count, empty,
+    explode, extension_loaded, in_array, parse_url_all, sprintf, strpos, strtolower, substr, trim,
+    urlencode,
 };
 
 use crate::cache::Cache;
@@ -821,7 +822,7 @@ impl GitHubDriver {
         Ok(Some(content))
     }
 
-    pub fn get_change_date(&mut self, identifier: &str) -> Result<Option<DateTime<Utc>>> {
+    pub fn get_change_date(&mut self, identifier: &str) -> Result<Option<DateTime<FixedOffset>>> {
         if let Some(ref mut git_driver) = self.git_driver {
             return git_driver.get_change_date(identifier);
         }
@@ -851,11 +852,8 @@ impl GitHubDriver {
             _ => String::new(),
         };
 
-        Ok(Some(
-            DateTime::parse_from_rfc3339(&date_str)
-                .map(|dt| dt.with_timezone(&Utc))
-                .unwrap_or_else(|_| Utc::now()),
-        ))
+        let date: DateTime<FixedOffset> = shirabe_php_shim::date_create(&date_str)?;
+        Ok(Some(date))
     }
 
     pub fn get_tags(&mut self) -> Result<IndexMap<String, String>> {
@@ -1364,7 +1362,10 @@ impl crate::repository::vcs::VcsDriverInterface for GitHubDriver {
         GitHubDriver::get_file_content(self, file, identifier)
     }
 
-    fn get_change_date(&mut self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    fn get_change_date(
+        &mut self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         GitHubDriver::get_change_date(self, identifier)
     }
 
diff --git a/crates/shirabe/src/repository/vcs/gitlab_driver.rs b/crates/shirabe/src/repository/vcs/gitlab_driver.rs
index 97dcc30..8ab30d4 100644
--- a/crates/shirabe/src/repository/vcs/gitlab_driver.rs
+++ b/crates/shirabe/src/repository/vcs/gitlab_driver.rs
@@ -2,13 +2,13 @@
 
 use crate::io::io_interface;
 use anyhow::Result;
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, FixedOffset};
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::{CaptureKey, Preg};
 use shirabe_php_shim::{
-    InvalidArgumentException, LogicException, PhpMixed, RuntimeException, array_search_mixed,
-    array_shift, ctype_alnum, empty, explode, extension_loaded, implode, in_array, is_array,
-    is_string, ord, sprintf, strpos, strtolower,
+    DATE_RFC3339, InvalidArgumentException, LogicException, PhpMixed, RuntimeException,
+    array_search_mixed, array_shift, ctype_alnum, empty, explode, extension_loaded, implode,
+    in_array, is_array, is_string, ord, sprintf, strpos, strtolower,
 };
 
 use crate::cache::Cache;
@@ -458,7 +458,7 @@ impl GitLabDriver {
         Ok(content)
     }
 
-    pub fn get_change_date(&mut self, identifier: &str) -> Result<Option<DateTime<Utc>>> {
+    pub fn get_change_date(&mut self, identifier: &str) -> Result<Option<DateTime<FixedOffset>>> {
         if let Some(ref mut git_driver) = self.git_driver {
             return git_driver.get_change_date(identifier);
         }
@@ -468,11 +468,8 @@ impl GitLabDriver {
                 .get("committed_date")
                 .and_then(|v| v.as_string())
                 .unwrap_or("");
-            return Ok(Some(
-                DateTime::parse_from_rfc3339(committed_date)
-                    .map(|dt| dt.with_timezone(&Utc))
-                    .unwrap_or_else(|_| Utc::now()),
-            ));
+            let date: DateTime<FixedOffset> = shirabe_php_shim::date_create(committed_date)?;
+            return Ok(Some(date));
         }
 
         Ok(None)
@@ -1153,7 +1150,10 @@ impl crate::repository::vcs::VcsDriverInterface for GitLabDriver {
         GitLabDriver::get_file_content(self, file, identifier)
     }
 
-    fn get_change_date(&mut self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    fn get_change_date(
+        &mut self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         GitLabDriver::get_change_date(self, identifier)
     }
 
diff --git a/crates/shirabe/src/repository/vcs/hg_driver.rs b/crates/shirabe/src/repository/vcs/hg_driver.rs
index c35a574..f637437 100644
--- a/crates/shirabe/src/repository/vcs/hg_driver.rs
+++ b/crates/shirabe/src/repository/vcs/hg_driver.rs
@@ -10,10 +10,10 @@ use crate::repository::vcs::VcsDriverBase;
 use crate::util::Filesystem;
 use crate::util::Hg as HgUtils;
 use crate::util::Url;
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, FixedOffset, Utc};
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::{CaptureKey, Preg};
-use shirabe_php_shim::{PhpMixed, RuntimeException, dirname, is_dir, is_writable};
+use shirabe_php_shim::{DATE_RFC3339, PhpMixed, RuntimeException, dirname, is_dir, is_writable};
 
 #[derive(Debug)]
 pub struct HgDriver {
@@ -197,7 +197,10 @@ impl HgDriver {
         Ok(Some(content))
     }
 
-    pub fn get_change_date(&self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    pub fn get_change_date(
+        &self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         if identifier.starts_with('-') {
             return Err(RuntimeException {
                 message: format!(
@@ -225,8 +228,8 @@ impl HgDriver {
             Some(self.repo_dir.clone()),
         );
 
-        let date = DateTime::parse_from_rfc3339(output.trim()).map(|d| d.with_timezone(&Utc))?;
-        Ok(Some(date))
+        let date: DateTime<Utc> = shirabe_php_shim::date_create(output.trim())?;
+        Ok(Some(date.fixed_offset()))
     }
 
     pub fn get_tags(&mut self) -> anyhow::Result<IndexMap<String, String>> {
@@ -410,7 +413,10 @@ impl crate::repository::vcs::VcsDriverInterface for HgDriver {
         HgDriver::get_file_content(self, file, identifier)
     }
 
-    fn get_change_date(&mut self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    fn get_change_date(
+        &mut self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         HgDriver::get_change_date(self, identifier)
     }
 
diff --git a/crates/shirabe/src/repository/vcs/perforce_driver.rs b/crates/shirabe/src/repository/vcs/perforce_driver.rs
index 0fe0f6f..65f2856 100644
--- a/crates/shirabe/src/repository/vcs/perforce_driver.rs
+++ b/crates/shirabe/src/repository/vcs/perforce_driver.rs
@@ -113,7 +113,7 @@ impl PerforceDriver {
     pub fn get_change_date(
         &self,
         _identifier: &str,
-    ) -> anyhow::Result<Option<chrono::DateTime<chrono::Utc>>> {
+    ) -> anyhow::Result<Option<chrono::DateTime<chrono::FixedOffset>>> {
         Ok(None)
     }
 
@@ -248,7 +248,7 @@ impl crate::repository::vcs::VcsDriverInterface for PerforceDriver {
     fn get_change_date(
         &mut self,
         identifier: &str,
-    ) -> anyhow::Result<Option<chrono::DateTime<chrono::Utc>>> {
+    ) -> anyhow::Result<Option<chrono::DateTime<chrono::FixedOffset>>> {
         PerforceDriver::get_change_date(self, identifier)
     }
 
diff --git a/crates/shirabe/src/repository/vcs/svn_driver.rs b/crates/shirabe/src/repository/vcs/svn_driver.rs
index ef8787a..f4e2bba 100644
--- a/crates/shirabe/src/repository/vcs/svn_driver.rs
+++ b/crates/shirabe/src/repository/vcs/svn_driver.rs
@@ -1,7 +1,7 @@
 //! ref: composer/src/Composer/Repository/Vcs/SvnDriver.php
 
 use anyhow::Result;
-use chrono::{DateTime, TimeZone, Utc};
+use chrono::{DateTime, FixedOffset, Utc};
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::{CaptureKey, Preg};
 use shirabe_php_shim::{
@@ -296,7 +296,7 @@ impl SvnDriver {
         Ok(Some(output))
     }
 
-    pub fn get_change_date(&mut self, identifier: &str) -> Result<Option<DateTime<Utc>>> {
+    pub fn get_change_date(&mut self, identifier: &str) -> Result<Option<DateTime<FixedOffset>>> {
         let identifier = format!("/{}/", trim(identifier, Some("/")));
 
         let (path, rev) = if let Ok(Some(m)) =
@@ -329,10 +329,9 @@ impl SvnDriver {
                 .unwrap_or(false)
                 {
                     let date_str = m.get(&CaptureKey::ByIndex(1)).cloned().unwrap_or_default();
-                    // PHP: new \DateTimeImmutable($match[1], new \DateTimeZone('UTC'))
-                    return Ok(Utc
-                        .datetime_from_str(date_str.trim(), "%Y-%m-%d %H:%M:%S %z")
-                        .ok());
+                    return Ok(shirabe_php_shim::date_create::<Utc>(date_str.trim())
+                        .ok()
+                        .map(|d| d.fixed_offset()));
                 }
             }
         }
@@ -638,7 +637,10 @@ impl crate::repository::vcs::VcsDriverInterface for SvnDriver {
         SvnDriver::get_file_content(self, file, identifier)
     }
 
-    fn get_change_date(&mut self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>> {
+    fn get_change_date(
+        &mut self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>> {
         SvnDriver::get_change_date(self, identifier)
     }
 
diff --git a/crates/shirabe/src/repository/vcs/vcs_driver.rs b/crates/shirabe/src/repository/vcs/vcs_driver.rs
index 94c3ff8..dc88387 100644
--- a/crates/shirabe/src/repository/vcs/vcs_driver.rs
+++ b/crates/shirabe/src/repository/vcs/vcs_driver.rs
@@ -1,9 +1,9 @@
 //! ref: composer/src/Composer/Repository/Vcs/VcsDriver.php
 
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, FixedOffset};
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::Preg;
-use shirabe_php_shim::{PhpMixed, extension_loaded};
+use shirabe_php_shim::{DATE_RFC3339, PhpMixed, extension_loaded};
 
 use crate::cache::Cache;
 use crate::config::Config;
@@ -94,7 +94,7 @@ impl VcsDriverBase {
     pub fn finish_base_composer_information(
         identifier: &str,
         composer_file_content: Option<String>,
-        change_date: impl FnOnce() -> anyhow::Result<Option<DateTime<Utc>>>,
+        change_date: impl FnOnce() -> anyhow::Result<Option<DateTime<FixedOffset>>>,
     ) -> anyhow::Result<Option<IndexMap<String, PhpMixed>>> {
         let content = match composer_file_content {
             None => return Ok(None),
@@ -123,7 +123,10 @@ impl VcsDriverBase {
                 .map_or(true, |v| v.as_string().map_or(true, |s| s.is_empty()))
         {
             if let Some(d) = change_date()? {
-                composer.insert("time".to_string(), PhpMixed::String(d.to_rfc3339()));
+                composer.insert(
+                    "time".to_string(),
+                    PhpMixed::String(d.format(DATE_RFC3339).to_string()),
+                );
             }
         }
 
@@ -284,7 +287,7 @@ pub trait VcsDriver: VcsDriverInterface {
             if let Some(change_date) = self.get_change_date(identifier)? {
                 composer.insert(
                     "time".to_string(),
-                    PhpMixed::String(change_date.to_rfc3339()),
+                    PhpMixed::String(change_date.format(DATE_RFC3339).to_string()),
                 );
             }
         }
diff --git a/crates/shirabe/src/repository/vcs/vcs_driver_interface.rs b/crates/shirabe/src/repository/vcs/vcs_driver_interface.rs
index e845300..5d2be04 100644
--- a/crates/shirabe/src/repository/vcs/vcs_driver_interface.rs
+++ b/crates/shirabe/src/repository/vcs/vcs_driver_interface.rs
@@ -2,7 +2,7 @@
 
 use crate::config::Config;
 use crate::io::IOInterface;
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, FixedOffset};
 use indexmap::IndexMap;
 use shirabe_php_shim::PhpMixed;
 use std::cell::RefCell;
@@ -18,7 +18,10 @@ pub trait VcsDriverInterface: std::fmt::Debug {
 
     fn get_file_content(&mut self, file: &str, identifier: &str) -> anyhow::Result<Option<String>>;
 
-    fn get_change_date(&mut self, identifier: &str) -> anyhow::Result<Option<DateTime<Utc>>>;
+    fn get_change_date(
+        &mut self,
+        identifier: &str,
+    ) -> anyhow::Result<Option<DateTime<FixedOffset>>>;
 
     fn get_root_identifier(&mut self) -> anyhow::Result<String>;