avoid chrono dependency, depend on proxmox 0.3.8

- remove chrono dependency

- depend on proxmox 0.3.8

- remove epoch_now, epoch_now_u64 and epoch_now_f64

- remove tm_editor (moved to proxmox crate)

- use new helpers from proxmox 0.3.8
  * epoch_i64 and epoch_f64
  * parse_rfc3339
  * epoch_to_rfc3339_utc
  * strftime_local

- BackupDir changes:
  * store epoch and rfc3339 string instead of DateTime
  * backup_time_to_string now return a Result
  * remove unnecessary TryFrom<(BackupGroup, i64)> for BackupDir

- DynamicIndexHeader: change ctime to i64

- FixedIndexHeader: change ctime to i64

src/tools/format.rs

@@ -1,6 +1,5 @@
 use anyhow::{Error};
 use serde_json::Value;
-use chrono::{Local, TimeZone, LocalResult};
 
 pub fn strip_server_file_expenstion(name: &str) -> String {
 
@@ -25,9 +24,10 @@ pub fn render_epoch(value: &Value, _record: &Value) -> Result<String, Error> {
     if value.is_null() { return Ok(String::new()); }
     let text = match value.as_i64() {
         Some(epoch) => {
-            match Local.timestamp_opt(epoch, 0) {
-                LocalResult::Single(epoch) => epoch.format("%c").to_string(),
-                _ => epoch.to_string(),
+            if let Ok(epoch_string) = proxmox::tools::time::strftime_local("%c", epoch as i64) {
+                epoch_string
+            } else {
+                epoch.to_string()
             }
         },
         None => {