diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0a4e880..ffac22b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Fixed
 
+- Fixes [#862](https://github.com/eamodio/vscode-gitlens/issues/862) - Command failed when expanding a local branch
+- Fixes [#860](https://github.com/eamodio/vscode-gitlens/issues/860) - Unknown date format error
 - Fixes [#858](https://github.com/eamodio/vscode-gitlens/issues/858) - GitHub avatars in blame line hovers are huge
 - Fixes issue with locating a working file when the file is staged or modified
 
diff --git a/src/git/git.ts b/src/git/git.ts
index 30b90b3..1a9e74e 100644
--- a/src/git/git.ts
+++ b/src/git/git.ts
@@ -870,7 +870,7 @@ export class Git {
 		repoPath: string,
 		{ all, branch, since }: { all?: boolean; branch?: string; since?: string } = {}
 	): Promise<string> {
-		const params = ['log', '-g', `--format=${GitReflogParser.defaultFormat}`, '--date=unix'];
+		const params = ['log', '-g', `--format=${GitReflogParser.defaultFormat}`, '--date=iso8601'];
 		if (all) {
 			params.push('--all');
 		}
diff --git a/src/git/parsers/branchParser.ts b/src/git/parsers/branchParser.ts
index 32b4873..79946fd 100644
--- a/src/git/parsers/branchParser.ts
+++ b/src/git/parsers/branchParser.ts
@@ -15,7 +15,7 @@ export class GitBranchParser {
 		`${lb}u${rb}%(upstream:short)`, // branch upstream
 		`${lb}t${rb}%(upstream:track)`, // branch upstream tracking state
 		`${lb}r${rb}%(objectname)`, // ref
-		`${lb}d${rb}%(committerdate:unix)` // committer date
+		`${lb}d${rb}%(committerdate:iso8601)` // committer date
 	].join('');
 
 	@debug({ args: false, singleLine: true })
@@ -57,7 +57,7 @@ export class GitBranchParser {
 					name,
 					remote,
 					current.charCodeAt(0) === 42, // '*',
-					new Date(Number(date) * 1000),
+					new Date(date),
 					// Stops excessive memory usage -- https://bugs.chromium.org/p/v8/issues/detail?id=2869
 					ref == null || ref.length === 0 ? undefined : ` ${ref}`.substr(1),
 					// Stops excessive memory usage -- https://bugs.chromium.org/p/v8/issues/detail?id=2869
diff --git a/src/git/parsers/reflogParser.ts b/src/git/parsers/reflogParser.ts
index 48350a8..23cee3f 100644
--- a/src/git/parsers/reflogParser.ts
+++ b/src/git/parsers/reflogParser.ts
@@ -13,7 +13,7 @@ const rb = '%x3e'; // `%x${'>'.charCodeAt(0).toString(16)}`;
 export class GitReflogParser {
 	static defaultFormat = [
 		`${lb}r${rb}%H`, // ref
-		`${lb}d${rb}%gD`, // reflog selector (with UNIX timestamp)
+		`${lb}d${rb}%gD`, // reflog selector (with iso8601 timestamp)
 		`${lb}s${rb}%gs` // reflog subject
 		// `${lb}n${rb}%D` // ref names
 	].join('');
@@ -95,7 +95,7 @@ export class GitReflogParser {
 					` ${sha}`.substr(1),
 					// Stops excessive memory usage -- https://bugs.chromium.org/p/v8/issues/detail?id=2869
 					` ${selector}`.substr(1),
-					new Date(Number(date) * 1000),
+					new Date(date),
 					// Stops excessive memory usage -- https://bugs.chromium.org/p/v8/issues/detail?id=2869
 					` ${command}`.substr(1),
 					// Stops excessive memory usage -- https://bugs.chromium.org/p/v8/issues/detail?id=2869