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date.go
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date.go
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// Copyright 2020 The Embedded Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"errors"
"fmt"
"strconv"
"strings"
"time"
"github.com/embeddedgo/stm32/hal/system/timer/rtcst"
)
const dateUsage = `
date
date YYYY-MM-DD hh:mm:ss
`
// time.Parse is too heavy
func parse(s, sep string) (v [3]int, err error) {
fields := strings.Split(s, sep)
if len(fields) != 3 {
err = errors.New("bad layout")
return
}
for i, f := range fields {
var u uint64
u, err = strconv.ParseUint(f, 10, 16)
if err != nil {
return
}
v[i] = int(u)
}
return
}
func date(args []string) {
now := time.Now()
switch len(args) {
case 3:
ymd, err := parse(args[1], "-")
if isErr(err) {
break
}
hms, err := parse(args[2], ":")
if isErr(err) {
break
}
t := time.Date(
ymd[0], time.Month(ymd[1]), ymd[2],
hms[0], hms[1], hms[2], 0, time.Local,
)
t0 := time.Set(now, t)
rtcst.StoreTime(t0, 0)
prompt = "> "
case 1:
fmt.Println(now.Format(timeLayout))
default:
fmt.Print(dateUsage)
}
}