78 lines
1.5 KiB
Go
78 lines
1.5 KiB
Go
// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"strconv"
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"time"
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)
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// Mon Jan 2 15:04:05 -0700 MST 2006
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const layout = "2006/01"
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// unknown is the zero value of a timestamp.
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var unknown = timestamp(time.Time{})
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// timestamp prints timestamps, it's a stringer.
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// It is useful even if it's zero.
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type timestamp time.Time
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// MarshalJSON from timestamp.
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func (ts timestamp) MarshalJSON() (out []byte, err error) {
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u := time.Time(ts).Unix()
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return strconv.AppendInt(out, u, 10), nil
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}
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// UnmarshalJSON data to timestamp.
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func (ts *timestamp) UnmarshalJSON(data []byte) error {
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s := string(data)
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// Let the ParseInt parse quoted strings.
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us, err := strconv.Unquote(s)
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if err == nil {
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s = us
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}
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// Always overwrite the timestamp when decoding.
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*ts = unknown
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// Handle the numeric case.
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if n, err := strconv.ParseInt(s, 10, 64); err == nil {
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*ts = timestamp(time.Unix(n, 0))
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}
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return nil
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}
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// String representation of the timestamp.
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func (ts timestamp) String() string {
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t := time.Time(ts)
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if t.IsZero() {
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return "unknown"
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}
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return t.Format(layout)
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}
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// toTimestamp from an unknown value.
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func toTimestamp(v interface{}) timestamp {
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var t int
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switch v := v.(type) {
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case int:
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t = v
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case string:
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t, _ = strconv.Atoi(v)
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default:
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return unknown
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}
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return timestamp(time.Unix(int64(t), 0))
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}
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