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// Copyright 2019 CUE Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package time
import (
"time"
)
// Common durations. There is no definition for units of Day or larger
// to avoid confusion across daylight savings time zone transitions.
//
// To count the number of units in a Duration, divide:
//
// second := time.Second
// fmt.Print(int64(second/time.Millisecond)) // prints 1000
//
// To convert an integer number of units to a Duration, multiply:
//
// seconds := 10
// fmt.Print(time.Duration(seconds)*time.Second) // prints 10s
const (
Nanosecond = 1
Microsecond = 1000
Millisecond = 1000000
Second = 1000000000
Minute = 60000000000
Hour = 3600000000000
)
// Duration validates a duration string.
//
// Note: this format also accepts strings of the form '1h3m', '2ms', etc.
// To limit this to seconds only, as often used in JSON, add the !~"hmuµn"
// constraint.
func Duration(s string) (bool, error) {
if _, err := time.ParseDuration(s); err != nil {
return false, err
}
return true, nil
}
// FormatDuration converts nanoseconds to a string representing the duration in
// the form "72h3m0.5s".
//
// Leading zero units are omitted. As a special case, durations less than
// one second use a smaller unit (milli-, micro-, or nanoseconds) to ensure
// that the leading digit is non-zero. The zero duration formats as 0s.
func FormatDuration(d int64) string {
return time.Duration(d).String()
}
// ParseDuration reports the nanoseconds represented by a duration string.
//
// A duration string is a possibly signed sequence of
// decimal numbers, each with optional fraction and a unit suffix,
// such as "300ms", "-1.5h" or "2h45m".
// Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
func ParseDuration(s string) (int64, error) {
d, err := time.ParseDuration(s)
if err != nil {
return 0, err
}
return int64(d), nil
}
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