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GUIDELINES...
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A properly formatted date uses the W3C-DTF encoding rules for dates and times, a profile based on ISO 8601.
The format consists of an ASCII date string of 10 characters for the standard date format YYYY-MM-DD (1998-01-24), unless time stamps are included (T08:15:30-05:00).
•Year (YYYY) is defined as 0000 to 9999.
•Month (MM) is defined as 01 to 12.
•Day (DD) is defined as 01 to 28, 29, 30 or 31 as applicable.
•The separator between date fields is a hyphen, (-).
If needed, a specific time stamp (Thh:mm:ssTZD) directly follows the date designation. It begins with the letter "T" to flag that a time stamp is present, followed by the actual time.
The time format (hh:mm:ss) consists of two digit designations for hours, minutes and seconds (19:20:30) in a 24 hour clock mode. If necessary, the seconds may be further defined by a decimal fraction of a second (19:20:30.45).
For precise compliance with the W3C-DTF encoding format, the time zone designator (TZD)completes the statement and consists of a + or - sign and the number of hours a particular time zone deviates from Greenwich Mean Time.
If the full date is unknown, month and year (YYYY-MM) or just year (YYYY) may be used.
Use free text to input B.C.E years as in 200 B.C.E.
For a range of years, enter the years on the same line, separating them with a space, hyphen, and space as in 1900 – 1950.
Follow dates with a question mark (1997?) to show a year is approximate, or a circa date.
Sometimes the time period is best expressed by a word or phrase instead of an actual year, month or day.
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