ISO 8601 format

The ISO 8601, or ISO 8601 time, format is either specified in Greenwich Mean time (GMT or Zulu): yyyy-mm-ddThhmmss.ssZ or with an optional time zone offset: yyyy-mm-ddThhmmss.ss+hh:mm or yyyy-mm-ddThhmmss.ss-hh:mm The hyphens in the date portion are optional and may be omitted; though for a negative time zone offset, a hyphen/minus must of course be specified. Spaces are ignored. Year is specified in four digits, each of month, day, hours, and minutes is specified in  exactly two digits (using a leading zero for values less than 10),  and seconds is typically specified in exactly two digits (using a leading zero for values less than 10) or optionally can include a decimal point followed  two more digits specifying hundredths of a second. Hours are specified on a 24 hour clock. For instance: 2013-05-22T12:30:00-08:00 Note that prior to Messaging Server 7.0, only a somewhat more restricted format was supported: hyphens were not permitted in the date, nor was a time zone offset permitted (Z was required), nor were fractions of a second (hundredths of a second) permitted.

The  utility may be used to test the validity of an ISO 8601 time string, as well as convert it into the (perhaps more familiar) date-time format used in RFC 822 header fields, such as Received: and Date: header fields.

See also:
 * alias_deferred_list Option
 * alias_deferred_mapping Option
 * alias_digest_recurrence Option
 * alias_creation_date Option
 * ldap_creation_date MTA Option
 * ldap_domain_attr_creation_date MTA Option
 * ldap_group_last_access_time MTA Option
 * ldap_start_date MTA Option
 * ldap_end_date MTA Option
 * Alias file named parameters
 * Sieve date and index extensions
 * test -time utility
 * ISO 8601 P format