update human-date-parser conversion to use local timezone (#14266)

# Description

This PR tries to fix https://github.com/nushell/nushell/issues/14195 by
setting the local time and timezone after conversion without changing
the time.

### Before
```nushell
❯ 'in 10 minutes' | into datetime
Tue, 5 Nov 2024 12:59:58 -0600 (in 9 minutes)
❯ 'yesterday' | into datetime
Sun, 3 Nov 2024 18:00:00 -0600 (2 days ago)
❯ 'tomorrow' | into datetime
Tue, 5 Nov 2024 18:00:00 -0600 (in 5 hours)
❯ 'today' | into datetime
Mon, 4 Nov 2024 18:00:00 -0600 (18 hours ago)
```

### After (these are correct)
```nushell
❯ 'in 10 minutes' | into datetime
Tue, 5 Nov 2024 12:58:44 -0600 (in 9 minutes)
❯ 'yesterday' | into datetime
Mon, 4 Nov 2024 12:49:04 -0600 (a day ago)
❯ 'tomorrow' | into datetime
Wed, 6 Nov 2024 12:49:20 -0600 (in a day)
❯ 'today' | into datetime
Tue, 5 Nov 2024 12:52:06 -0600 (now)
```

# User-Facing Changes
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helps us keep track of breaking changes. -->

# Tests + Formatting
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crates/nu-command/src/conversions/into/datetime.rs

@@ -1,5 +1,5 @@
 use crate::{generate_strftime_list, parse_date_from_string};
-use chrono::{DateTime, FixedOffset, Local, NaiveDateTime, NaiveTime, TimeZone, Utc};
+use chrono::{DateTime, FixedOffset, Local, NaiveDateTime, TimeZone, Utc};
 use human_date_parser::{from_human_time, ParseResult};
 use nu_cmd_base::input_handler::{operate, CmdArgument};
 use nu_engine::command_prelude::*;
@@ -275,12 +275,13 @@ fn action(input: &Value, args: &Arguments, head: Span) -> Value {
                     if let Ok(date) = from_human_time(&input_val) {
                         match date {
                             ParseResult::Date(date) => {
-                                let time = NaiveTime::from_hms_opt(0, 0, 0).expect("valid time");
+                                let time = Local::now().time();
                                 let combined = date.and_time(time);
-                                let dt_fixed = DateTime::from_naive_utc_and_offset(
+                                let local_offset = *Local::now().offset();
-                                    combined,
+                                let dt_fixed =
-                                    *Local::now().offset(),
+                                    TimeZone::from_local_datetime(&local_offset, &combined)
-                                );
+                                        .single()
+                                        .unwrap_or_default();
                                 return Value::date(dt_fixed, span);
                             }
                             ParseResult::DateTime(date) => {
@@ -289,10 +290,11 @@ fn action(input: &Value, args: &Arguments, head: Span) -> Value {
                             ParseResult::Time(time) => {
                                 let date = Local::now().date_naive();
                                 let combined = date.and_time(time);
-                                let dt_fixed = DateTime::from_naive_utc_and_offset(
+                                let local_offset = *Local::now().offset();
-                                    combined,
+                                let dt_fixed =
-                                    *Local::now().offset(),
+                                    TimeZone::from_local_datetime(&local_offset, &combined)
-                                );
+                                        .single()
+                                        .unwrap_or_default();
                                 return Value::date(dt_fixed, span);
                             }
                         }
@@ -386,13 +388,15 @@ fn action(input: &Value, args: &Arguments, head: Span) -> Value {
                 Ok(d) => Value::date ( d, head ),
                 Err(reason) => {
                     match NaiveDateTime::parse_from_str(val, &dt.0) {
-                        Ok(d) => Value::date (
+                        Ok(d) => {
-                            DateTime::from_naive_utc_and_offset(
+                            let local_offset = *Local::now().offset();
-                                d,
+                            let dt_fixed =
-                                *Local::now().offset(),
+                                TimeZone::from_local_datetime(&local_offset, &d)
-                            ),
+                                    .single()
-                            head,
+                                    .unwrap_or_default();
-                        ),
+
+                            Value::date (dt_fixed,head)
+                        }
                         Err(_) => {
                             Value::error (
                                 ShellError::CantConvert { to_type: format!("could not parse as datetime using format '{}'", dt.0), from_type: reason.to_string(), span: head, help: Some("you can use `into datetime` without a format string to enable flexible parsing".to_string()) },