Formal metadata information and software > CSDGM 1994 (superseded)
This document has been superseded. Everyone should refer instead to the Content Standard for Digital Geospatial Metadata, officially known as FGDC-STD-001-1998, dated June 1998, at the web site of the Federal Geographic Data Committee.

9: Time Period Information -- information about the date and time of an event.

This section provides a means of stating temporal information, and is used by other sections of the metadata standard. This section is never used alone.

Syntax:

Time_Period_Information =
[Single_Date/Time | Multiple_Dates/Times | Range_of_Dates/Times ]
Single_Date/Time =
Calendar_Date + (Time_of_Day)
Multiple_Dates/Times =
2{Calendar_Date + (Time_of_Day) }n
Range_of_Dates/Times =
Beginning_Date + (Beginning_Time) + Ending_Date + (Ending_Time)

Semantics:

Single Date/Time -- 9.1
means of encoding a single date and time. Compound.
Calendar Date -- 9.1.1
the year (and optionally month, or month and day).
Type: date
Domain: "Unknown" free date
Time of Day -- 9.1.2
the hour (and optionally minute, or minute and second) of the day.
Type: time
Domain: "Unknown" free time
Multiple Dates/Times -- 9.2
means of encoding multiple individual dates and times. Compound.
Calendar Date -- (9.1.1)
Time of Day -- (9.1.2)
Range of Dates/Times -- 9.3
means of encoding a range of dates and times. Compound.
Beginning Date -- 9.3.1
the first year (and optionally month, or month and day) of the event.
Type: date
Domain: "Unknown" free date
Beginning Time -- 9.3.2
the first hour (and optionally minute, or minute and second) of the day for the event.
Type: time
Domain: "Unknown" free time
Ending Date -- 9.3.3
the last year (and optionally month, or month and day) for the event.
Type: date
Domain: "Unknown" "Present" free date
Ending Time -- 9.3.4
the last hour (and optionally minute, or minute and second) of the day for the event.
Type: time
Domain: "Unknown" free time
USGS tools and info for formal metadata
This page is http://geology.usgs.gov/tools/metadata/standard/
Maintained by Peter Schweitzer
Last updated 20-Jul-1998