(subplotlib): Remove dependency on chrono

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

2 files changed, 9 insertions, 4 deletions

diff --git a/subplotlib/Cargo.toml b/subplotlib/Cargo.toml
index ed3fb8a..554b454 100644
--- a/subplotlib/Cargo.toml
+++ b/subplotlib/Cargo.toml
@@ -22,7 +22,7 @@ base64 = "0.13"
 state = "0.5"
 tempfile = "3.1"
 fs2 = "0.4"
-chrono = "0.4"
+time = { version = "0.3", features = ["parsing"] }
 filetime = "0.2"
 regex = "1.4"
 shell-words = "1.0"
diff --git a/subplotlib/src/steplibrary/files.rs b/subplotlib/src/steplibrary/files.rs
index 991cd88..1a55f7a 100644
--- a/subplotlib/src/steplibrary/files.rs
+++ b/subplotlib/src/steplibrary/files.rs
@@ -10,9 +10,10 @@ use std::io::{self, Write};
 use std::path::PathBuf;
 use std::time::{Duration, SystemTime};
 
-use chrono::{TimeZone, Utc};
 use filetime::FileTime;
 use regex::Regex;
+use time::macros::format_description;
+use time::OffsetDateTime;
 
 pub use crate::prelude::*;
 
@@ -86,8 +87,12 @@ pub fn create_from_embedded_with_other_name(
 /// If the file does not exist, it will be created.
 #[step]
 pub fn touch_with_timestamp(context: &Datadir, filename: &str, mtime: &str) {
-    let ts = Utc.datetime_from_str(mtime, "%Y-%m-%d %H:%M:%S")?;
-    let (secs, nanos) = (ts.timestamp(), ts.timestamp_subsec_nanos());
+    let fd = format_description!(
+        "[year]-[month]-[day] [hour]:[minute]:[second] [offset_hour]:[offset_minute]"
+    );
+    let full_time = format!("{} +00:00", mtime);
+    let ts = OffsetDateTime::parse(&full_time, &fd)?;
+    let (secs, nanos) = (ts.unix_timestamp(), 0);
     let mtime = FileTime::from_unix_time(secs, nanos);
     let full_path = context.canonicalise_filename(filename)?;
     // If the file doesn't exist, create it