GitHub - phuslu/fasttime: fast time format for go
source link: https://github.com/phuslu/fasttime
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fasttime - fast time formatting for go
Getting Started
try on https://go.dev/play/p/wnb6G181qu6
package main
import (
"time"
"github.com/phuslu/fasttime"
)
func main() {
println(fasttime.Strftime("%a %b %d %H:%M:%S %Z %Y", time.Now()))
}
// Thu Dec 17 10:49:04 +08 2020
Benchmarks
// go test -v -cpu=4 -run=none -bench=. -benchmem strftime_test.go
package strftime_test
import (
"io"
"testing"
"time"
itchyny "github.com/itchyny/timefmt-go"
lestrrat "github.com/lestrrat-go/strftime"
fasttime "github.com/phuslu/fasttime"
)
var now = time.Now()
func BenchmarkUnixDateStdTime(b *testing.B) {
for i := 0; i < b.N; i++ {
now.Format(time.UnixDate)
}
}
func BenchmarkUnixDateLestrrat(b *testing.B) {
p, _ := lestrrat.New("%a %b %e %H:%M:%S %Z %Y")
for i := 0; i < b.N; i++ {
p.Format(io.Discard, now)
}
}
func BenchmarkUnixDateItchyny(b *testing.B) {
for i := 0; i < b.N; i++ {
itchyny.Format(now, "%a %b %e %H:%M:%S %Z %Y")
}
}
func BenchmarkUnixDateFasttime(b *testing.B) {
for i := 0; i < b.N; i++ {
fasttime.Strftime("%a %b %e %H:%M:%S %Z %Y", now)
}
}
func BenchmarkStampMicroStdTime(b *testing.B) {
for i := 0; i < b.N; i++ {
now.Format(time.StampMicro)
}
}
func BenchmarkStampMicroLestrrat(b *testing.B) {
p, _ := lestrrat.New("%b %e %H:%M:%S.%f", lestrrat.WithMicroseconds('f'))
for i := 0; i < b.N; i++ {
p.Format(io.Discard, now)
}
}
func BenchmarkStampMicroItchyny(b *testing.B) {
for i := 0; i < b.N; i++ {
itchyny.Format(now, "%b %e %H:%M:%S.%f")
}
}
func BenchmarkStampMicroFasttime(b *testing.B) {
for i := 0; i < b.N; i++ {
fasttime.Strftime("%b %e %H:%M:%S.%f", now)
}
}
func BenchmarkRFC3339StdTime(b *testing.B) {
for i := 0; i < b.N; i++ {
now.Format(time.RFC3339)
}
}
func BenchmarkRFC3339Lestrrat(b *testing.B) {
p, _ := lestrrat.New("%Y-%m-%dT%H:%M:%S%z")
for i := 0; i < b.N; i++ {
p.Format(io.Discard, now)
}
}
func BenchmarkRFC3339Itchyny(b *testing.B) {
for i := 0; i < b.N; i++ {
itchyny.Format(now, "%Y-%m-%dT%H:%M:%S%:z")
}
}
func BenchmarkRFC3339Fasttime(b *testing.B) {
for i := 0; i < b.N; i++ {
fasttime.Strftime("%Y-%m-%dT%H:%M:%S%:z", now)
}
}
A Performance result as below, for daily benchmark results see github actions
BenchmarkUnixDateStdTime-4 3134547 359.0 ns/op 32 B/op 1 allocs/op
BenchmarkUnixDateLestrrat-4 2445044 505.8 ns/op 64 B/op 1 allocs/op
BenchmarkUnixDateItchyny-4 3726554 316.0 ns/op 0 B/op 0 allocs/op
BenchmarkUnixDateFasttime-4 4719768 245.8 ns/op 0 B/op 0 allocs/op
BenchmarkStampMicroStdTime-4 3793047 318.8 ns/op 24 B/op 1 allocs/op
BenchmarkStampMicroLestrrat-4 2409372 477.2 ns/op 72 B/op 2 allocs/op
BenchmarkStampMicroItchyny-4 4752626 242.8 ns/op 0 B/op 0 allocs/op
BenchmarkStampMicroFasttime-4 7268750 164.2 ns/op 0 B/op 0 allocs/op
BenchmarkRFC3339StdTime-4 3563881 336.0 ns/op 24 B/op 1 allocs/op
BenchmarkRFC3339Lestrrat-4 2520579 480.9 ns/op 64 B/op 1 allocs/op
BenchmarkRFC3339Itchyny-4 4386028 273.3 ns/op 0 B/op 0 allocs/op
BenchmarkRFC3339Fasttime-4 6393230 189.1 ns/op 0 B/op 0 allocs/op
Supported formats:
code | Description |
---|---|
%a |
The abbreviated name of the day of the week according to the current locale. |
%A |
The full name of the day of the week according to the current locale. |
%b |
The abbreviated month name according to the current locale. |
%B |
The full month name according to the current locale. |
%c |
The preferred date and time representation for the current locale. |
%C |
The century number (year/100) as a 2-digit integer. |
%d |
The day of the month as a decimal number (range 01 to 31). |
%D |
Equivalent to %m/%d/%y. (Yecch—for Americans only.) |
%e |
Like %d, the day of the month as a decimal number, but a leading zero is replaced by a space. |
%f |
Microsecond as a decimal number, zero-padded on the left. |
%F |
Equivalent to %Y-%m-%d (the ISO 8601 date format). |
%G |
The ISO 8601 week-based year (see NOTES) with century as a decimal number. The 4-digit year corresponding to the ISO week number (see %V). This has the same format and value as %Y, except that if the ISO week number belongs to the previous or next year, that year is used instead. |
%g |
Like %G, but without century, that is, with a 2-digit year (00-99). |
%h |
Equivalent to %b. |
%H |
The hour as a decimal number using a 24-hour clock (range 00 to 23). |
%I |
The hour as a decimal number using a 12-hour clock (range 01 to 12). |
%j |
The day of the year as a decimal number (range 001 to 366). |
%k |
The hour (24-hour clock) as a decimal number (range 0 to 23); single digits are preceded by a blank. (See also %H.) |
%l |
The hour (12-hour clock) as a decimal number (range 1 to 12); single digits are preceded by a blank. (See also %I.) |
%m |
The month as a decimal number (range 01 to 12). |
%M |
The minute as a decimal number (range 00 to 59). |
%n |
A newline character. |
%N |
Nanosecond as a decimal number, zero-padded on the left. |
%p |
Either "AM" or "PM" according to the given time value, or the corresponding strings for the current locale. Noon is treated as "PM" and midnight as "AM". |
%P |
Like %p but in lowercase: "am" or "pm" or a corresponding string for the current locale. |
%Q |
Millisecond as a decimal number, zero-padded on the left. |
%r |
The time in a.m. or p.m. notation. In the POSIX locale this is equivalent to %I:%M:%S %p. |
%R |
The time in 24-hour notation (%H:%M). For a version including the seconds, see %T below. |
%s |
The number of seconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC). |
%S |
The second as a decimal number (range 00 to 60). (The range is up to 60 to allow for occasional leap seconds.) |
%t |
A tab character. |
%T |
The time in 24-hour notation (%H:%M:%S). |
%u |
The day of the week as a decimal, range 1 to 7, Monday being 1. See also %w. |
%U |
The week number of the current year as a decimal number, range 00 to 53, starting with the first Sunday as the first day of week 01. See also %V and %W. |
%v |
Equivalent to %e-%b-%Y. |
%V |
The ISO 8601 week number (see NOTES) of the current year as a decimal number, range 01 to 53, where week 1 is the first week that has at least 4 days in the new year. See also %U and %W. |
%w |
The day of the week as a decimal, range 0 to 6, Sunday being 0. See also %u. |
%W |
The week number of the current year as a decimal number, range 00 to 53, starting with the first Monday as the first day of week 01. |
%x |
The preferred date representation for the current locale without the time. |
%X |
The preferred time representation for the current locale without the date. |
%y |
The year as a decimal number without a century (range 00 to 99). |
%Y |
The year as a decimal number including the century. |
%z |
The +hhmm or -hhmm numeric timezone (that is, the hour and minute offset from UTC). |
%Z |
The timezone name or abbreviation. |
%+ |
The date and time in date(1) format. |
%% |
A literal '%' character. |
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