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/backup/catalog.rs

@@ -5,7 +5,6 @@ use std::io::{Read, Write, Seek, SeekFrom};
 use std::os::unix::ffi::OsStrExt;
 
 use anyhow::{bail, format_err, Error};
-use chrono::offset::{TimeZone, Local, LocalResult};
 
 use pathpatterns::{MatchList, MatchType};
 use proxmox::tools::io::ReadExt;
@@ -533,10 +532,10 @@ impl <R: Read + Seek> CatalogReader<R> {
                     self.dump_dir(&path, pos)?;
                 }
                 CatalogEntryType::File => {
-                    let mtime_string = match Local.timestamp_opt(mtime as i64, 0) {
-                        LocalResult::Single(time) => time.to_rfc3339_opts(chrono::SecondsFormat::Secs, false),
-                        _ => (mtime as i64).to_string(),
-                    };
+                    let mut mtime_string = mtime.to_string();
+                    if let Ok(s) = proxmox::tools::time::strftime_local("%FT%TZ", mtime as i64) {
+                        mtime_string = s;
+                    }
 
                     println!(
                         "{} {:?} {} {}",