2.2.1.4 Timestamp
This section specifies the ABNF rules for timestamp values. A timestamp can be specified inside a common node at the root level of an XML element.
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timestamp_high = 1*DIGIT timestamp_low = 1*DIGIT timestamp = ":" timestamp_high ":" timestamp_low ":"
timestamp_high: A string representation of a decimal integer that corresponds to the value of the dwHighDateTime member of a FILETIME structure ([MS-DTYP] section 2.3.3).
timestamp_low: A string representation of a decimal integer that corresponds to the value of the dwLowDateTime member of a FILETIME structure.
A timestamp value MUST be defined at the root level of Calendar elements (section 2.2.5.7). See the Calendar example (section 4.2.6).