tools

Add UNIX time to ISO 8601 and vice versa converter

Diffstat

4 files changed, 60 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ae3c172
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/bin/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..18b0296
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,12 @@
+.PHONY: all build test help
+all: help
+
+build: ## Build the project
+	@go build -C ./src/unixtime -o ../../bin/unixtime .
+
+test: ## Run unit tests
+	@go tets ./...
+
+help: ## Display help information
+	@grep -E '^[a-zA-Z_-]+:.*?##.*$$' $(MAKEFILE_LIST) | \
+		awk 'BEGIN {FS = ":.*?## *"}; {printf "\033[36m%-6s\033[0m %s\n", $$1, $$2}'
diff --git a/src/unixtime/go.mod b/src/unixtime/go.mod
new file mode 100644
index 0000000..a80322f
--- /dev/null
+++ b/src/unixtime/go.mod
@@ -0,0 +1,3 @@
+module unixtime
+
+go 1.22
diff --git a/src/unixtime/main.go b/src/unixtime/main.go
new file mode 100644
index 0000000..b812d61
--- /dev/null
+++ b/src/unixtime/main.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"time"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("Usage: unixtime timestamp...")
+		os.Exit(-1)
+	}
+
+	for _, a := range os.Args[1:] {
+		fmt.Println(a, "->", unixtime(a))
+	}
+}
+
+func unixtime(s string) string {
+	if isUnixTime(s) {
+		ns, _ := strconv.ParseInt(s, 10, 64)
+		t := time.Unix(0, ns).UTC()
+		return t.Format("2006-01-02T15:04:05.999999Z")
+	} else {
+		t, err := time.Parse("2006-01-02T15:04:05.999999Z", s)
+		if err != nil {
+			log.Fatalln(err.Error())
+		}
+
+		return strconv.FormatInt(t.UnixNano(), 10)
+	}
+}
+
+func isUnixTime(s string) bool {
+	for _, r := range s {
+		if r < '0' || r > '9' {
+			return false
+		}
+	}
+	return true
+}