package session

import "time"

// sessionTimeLayout is the fixed-width timestamp layout used for every stored
// created_at/updated_at value. Unlike time.RFC3339Nano it never drops trailing
// fractional zeros, so every value is exactly sessionTimeLen bytes wide. SQLite
// compares these TEXT columns as plain strings, and equal width is what makes
// that comparison agree with chronological order. Values are written in UTC, so
// the Z07:00 zone renders as a single "Z".
const sessionTimeLayout = "2006-01-02T15:04:05.000000000Z07:00"

// sessionTimeLen is the byte length of a UTC value formatted with
// sessionTimeLayout: "2006-01-02T15:04:05.000000000Z" — the Z07:00 zone
// collapses to "Z" in UTC.
const sessionTimeLen = 30

// formatSessionTime encodes t in UTC with the fixed-width sessionTimeLayout.
func formatSessionTime(t time.Time) string {
	return t.UTC().Format(sessionTimeLayout)
}