1package driver
 2
 3import (
 4	"bytes"
 5	"time"
 6)
 7
 8// Convert a string in [time.RFC3339Nano] format into a [time.Time]
 9// if it roundtrips back to the same string.
10// This way times can be persisted to, and recovered from, the database,
11// but if a string is needed, [database/sql] will recover the same string.
12func maybeTime(text []byte) (_ time.Time, _ bool) {
13	// Weed out (some) values that can't possibly be
14	// [time.RFC3339Nano] timestamps.
15	if len(text) < len("2006-01-02T15:04:05Z") {
16		return
17	}
18	if len(text) > len(time.RFC3339Nano) {
19		return
20	}
21	if text[4] != '-' || text[10] != 'T' || text[16] != ':' {
22		return
23	}
24
25	// Slow path.
26	var buf [len(time.RFC3339Nano)]byte
27	date, err := time.Parse(time.RFC3339Nano, string(text))
28	if err == nil && bytes.Equal(text, date.AppendFormat(buf[:0], time.RFC3339Nano)) {
29		return date, true
30	}
31	return
32}