1 files changed, 37 insertions, 0 deletions
diff --git a/internal/router/api-v1-tz.go b/internal/router/api-v1-tz.go
new file mode 100644
index 0000000..4e4e462
--- /dev/null
+++ b/internal/router/api-v1-tz.go
@@ -0,0 +1,37 @@
+package router
+
+import (
+	"log/slog"
+	"time"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func Api_V1_TZ() func(c *fiber.Ctx) error {
+	return func(c *fiber.Ctx) error {
+		timestampString := c.Query("timestamp")
+		tz := c.Query("tz")
+
+		loc, err := time.LoadLocation(tz)
+		if err != nil {
+			loc = time.UTC
+			slog.Warn("unable to parse a client timezone, defaulting to UTC", slog.String("error", err.Error()), slog.String("tz", tz))
+		}
+
+		var format string
+		var timestamp time.Time
+		for _, format = range []string{"2006-01-02 15:04:05 -07:00", time.RFC3339} {
+			if timestamp, err = time.Parse(format, timestampString); err == nil {
+				break
+			}
+		}
+
+		c.Set(fiber.HeaderContentType, fiber.MIMETextPlainCharsetUTF8)
+
+		if err != nil {
+			return c.Status(fiber.StatusBadRequest).SendString("invalid timestamp format")
+		}
+
+		return c.Status(fiber.StatusOK).SendString(timestamp.In(loc).Format(format))
+	}
+}