Use localtime() to format time_t in cvtTimeToZ().
Use localtime() to format time_t in cvtTimeToZ().

Using gmtime() produced output skewed by the local timezone.

Since this function is currently only used for debug logging this is not a live bug in the field.

pgbackrest/pgbackrest,pgmasters/backrest,pgmasters/backrest,pgbackrest/pgbackrest,pgbackrest/pgbackrest