Move getDate to util file

server/util.go

@@ -0,0 +1,30 @@
+package server
+
+import (
+	"fmt"
+	"strconv"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+func getDate(c *gin.Context) (time.Time, error) {
+	var year, month int
+	yearString := c.Param("year")
+	monthString := c.Param("month")
+	if yearString == "" && monthString == "" {
+		return getFirstOfMonthTime(time.Now()), nil
+	}
+
+	year, err := strconv.Atoi(yearString)
+	if err != nil {
+		return time.Time{}, fmt.Errorf("parse year: %w", err)
+	}
+
+	month, err = strconv.Atoi(monthString)
+	if err != nil {
+		return time.Time{}, fmt.Errorf("parse month: %w", err)
+	}
+
+	return getFirstOfMonth(year, month, time.Now().Location()), nil
+}