Use third-party library to convert time.Time to UTC string

app/server/conversion/converters_default.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/phuslu/fasttime"
+
 	"github.com/ydb-platform/fq-connector-go/common"
 )
 
@@ -137,11 +139,11 @@ func (timestampToStringConverterUTC) Convert(in *time.Time) (string, error) {
 	// ClickHouse - 1 nanosecond  (10^-9 s)
 	// Oracle -  1 nanosecond  (10^-9 s)
 	// Trailing zeros are omitted
-	return in.UTC().Format("2006-01-02T15:04:05.999999999Z"), nil
+	return fasttime.Strftime("%Y-%m-%dT%H:%M:%S.%N%:z", in.UTC()), nil
 }
 
 type timestampToStringConverterNaive struct{}
 
 func (timestampToStringConverterNaive) Convert(in *time.Time) (string, error) {
-	return in.Format("2006-01-02T15:04:05.999999999"), nil
+	return fasttime.Strftime("%Y-%m-%dT%H:%M:%S.%N%:z", *in), nil
 }

go.mod

@@ -83,6 +83,7 @@ require (
 	github.com/minio/asm2plan9s v0.0.0-20200509001527-cdd76441f9d8 // indirect
 	github.com/minio/c2goasm v0.0.0-20190812172519-36a3d3bbc4f3 // indirect
 	github.com/paulmach/orb v0.11.1 // indirect
+	github.com/phuslu/fasttime v1.0.2
 	github.com/pierrec/lz4/v4 v4.1.18 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/segmentio/asm v1.2.0 // indirect