diff --git a/src/header/time/cbindgen.toml b/src/header/time/cbindgen.toml
index d2476bd3b3..b223e844b8 100644
--- a/src/header/time/cbindgen.toml
+++ b/src/header/time/cbindgen.toml
@@ -1,4 +1,16 @@
-sys_includes = ["sys/types.h", "stdint.h", "stddef.h", "features.h"]
+# POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/time.h.html
+#
+# Spec quotations relating to includes:
+# - "The <time.h> header shall define the clock_t, size_t, time_t, types as described in <sys/types.h>."
+# - "The <time.h> header shall define the clockid_t and timer_t types as described in <sys/types.h>."
+# - "The <time.h> header shall define the locale_t type as described in <locale.h>."
+# - "The <time.h> header shall define the pid_t type as described in <sys/types.h>."
+# - "The tag sigevent shall be declared as naming an incomplete structure type, the contents of which are described in the <signal.h> header."
+# - "NULL As described in <stddef.h>."
+# - "Inclusion of the <time.h> header may make visible all symbols from the <signal.h> header."
+#
+# features.h included for deprecated annotations
+sys_includes = ["sys/types.h", "stddef.h", "features.h"]
 include_guard = "_RELIBC_TIME_H"
 language = "C"
 style = "Tag"
@@ -6,6 +18,8 @@ no_includes = true
 cpp_compat = true
 after_includes = """
 #include <bits/timespec.h> // for timespec
+#include <bits/locale-t.h> // for locale_t from locale.h
+
 struct sigevent;
 """
 
diff --git a/src/header/time/constants.rs b/src/header/time/constants.rs
index 2b3d3ba645..b44b4116e5 100644
--- a/src/header/time/constants.rs
+++ b/src/header/time/constants.rs
@@ -10,9 +10,12 @@ pub mod sys;
 
 pub use self::sys::*;
 
+/// cbindgen:ignore
 pub(crate) const UTC: *const c_char = c"UTC".as_ptr().cast();
 
+/// cbindgen:ignore
 pub(crate) const DAY_NAMES: [&str; 7] = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
+/// cbindgen:ignore
 pub(crate) const MON_NAMES: [&str; 12] = [
     "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
 ];
diff --git a/src/header/time/mod.rs b/src/header/time/mod.rs
index 5e8637c33d..979d6a5f84 100644
--- a/src/header/time/mod.rs
+++ b/src/header/time/mod.rs
@@ -39,10 +39,15 @@ mod strftime;
 mod strptime;
 pub use strptime::strptime;
 
+/// cbindgen:ignore
 const YEARS_PER_ERA: time_t = 400;
+/// cbindgen:ignore
 const DAYS_PER_ERA: time_t = 146097;
+/// cbindgen:ignore
 const SECS_PER_DAY: time_t = 24 * 60 * 60;
+/// cbindgen:ignore
 pub(crate) const NANOSECONDS: c_long = 1_000_000_000;
+/// cbindgen:ignore
 const UTC_STR: &core::ffi::CStr = c"UTC";
 
 /// timer_t internal data, ABI unstable
@@ -73,6 +78,7 @@ impl timer_internal_t {
 }
 
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/time.h.html>.
+#[allow(non_camel_case_types)]
 #[repr(C)]
 pub struct tm {
     pub tm_sec: c_int,          // 0 - 60
@@ -90,9 +96,11 @@ pub struct tm {
 
 unsafe impl Sync for tm {}
 
+/// cbindgen:ignore
 // The C Standard says that localtime and gmtime return the same pointer.
 static GMTIME_LOCALTIME_RETURN_TM: RawCell<tm> = RawCell::new(blank_tm());
 
+/// cbindgen:ignore
 // The C Standard says that ctime and asctime return the same pointer.
 static mut ASCTIME: [c_char; 26] = [0; 26];
 
@@ -101,9 +109,11 @@ pub struct TzName([*mut c_char; 2]);
 
 unsafe impl Sync for TzName {}
 
+/// cbindgen:ignore
 // Name storage for the `tm_zone` field.
 static TIMEZONE_NAMES: Mutex<OnceCell<BTreeSet<CString>>> = Mutex::new(OnceCell::new());
 
+/// cbindgen:ignore
 // relibc functions should hold `TIMEZONE_LOCK` when accessing `daylight`,
 // `timezone`, and `tzname`. However, it cannot guard those variables against
 // user access (see `tzset()` specs for details).
@@ -132,6 +142,7 @@ pub static mut tzname: TzName = TzName([ptr::null_mut(); 2]);
 pub static mut getdate_err: c_int = 0;
 
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/time.h.html>.
+#[allow(non_camel_case_types)]
 #[repr(C)]
 #[derive(Clone, Default)]
 pub struct itimerspec {
diff --git a/src/header/time/strptime.rs b/src/header/time/strptime.rs
index f49c5b54b6..b4e3d35904 100644
--- a/src/header/time/strptime.rs
+++ b/src/header/time/strptime.rs
@@ -11,8 +11,10 @@ use core::{
     str,
 };
 
+/// cbindgen:ignore
 /// For convenience, we define some helper constants for the C-locale.
 const SHORT_DAYS: [&str; 7] = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
+/// cbindgen:ignore
 const LONG_DAYS: [&str; 7] = [
     "Sunday",
     "Monday",
@@ -22,9 +24,11 @@ const LONG_DAYS: [&str; 7] = [
     "Friday",
     "Saturday",
 ];
+/// cbindgen:ignore
 const SHORT_MONTHS: [&str; 12] = [
     "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
 ];
+/// cbindgen:ignore
 const LONG_MONTHS: [&str; 12] = [
     "January",
     "February",