033 Subfield $a - Formatted date/time:
Subfield $a contains the actual or approximate date/time of capture, finding, or broadcast. The date/time information is seventeen characters in length, recorded in the pattern yyyymmddhhmm±hhmm.
yyyymmdd The first eight characters (4 for the year, 2 for the month, and 2 for the day) represent the date and are mandatory if the subfield is used. If any of the first eight characters are unknown, a hyphen ( - ) is used for the unknown digits.
hhmm The following four characters (2 for the hour, 2 for the minute), represent the time as hour and minute.
±hhmm The last 5 character positions give the Time Differential Factor (TDF) information. The TDF is preceded by a plus ( + ) or minus ( - ) sign, indicating the hours and minutes the local time is ahead of or behind Universal Time (Greenwich Mean Time), respectively. Local times throughout the world vary from Universal Time by as much as -1200 (west of the Greenwich Meridian) and by as much as +1300 hours (east of the Greenwich Meridian).
For the hour, in all cases, the 24-hour clock (00-23) is used. Within each date/time component, the data is right justified and any unused position contains a zero.
Multiple single date/times and date/times in a range associated with the same type of event may be contained in repeating $a subfields, with earlier times preceding later ones.
Examples:
518 ## $aSigned and dated 1858 in the medium.
033 00 $a1858----
[An original or historical graphic item that was executed in 1858.]
033 02 $a19750305$b4034$cR4
[A meteorite that was found on March 5, 1975, in Richmond, Texas.]
518 ## $aBroadcast October 17, 1954 at 7:30 p.m. (PST).
033 01 $a195410171930-0700.
[A television program.]
518 ## $aBroadcast September 7, 1987 at 7:00 p.m. (EST) and subsequently rebroadcast October 1, 1987 at 8:30 p.m. (EST).
033 11 $a198709071900-0400$a198710012030-0400
[A radio program.]
518 ## $aBroadcast every night at 8:00 p.m. (EST) from September 10 to September 14, 1978.
033 21 $a197809102000-0400$a197809142000-0400
[A television mini-series.]
518 ## $aBroadcast at 9:30 p.m. (EST) in 1962.
033 01 $a1962----2130
[An episode of a television series with the specific broadcast date unknown, but known to have been broadcast at 9:30 p.m. (EST).]
033 01 $a198707281409+0530$b7654$cC2
[A radio program broadcast at 2 hours, 9 minutes and 23 seconds past noon on July 28, 1987 in Calcutta, India (five and one-half hours different from the Universal Time and east of the Greenwich Meridian).]
If an exact date is not specified, an approximate date or span of dates is recorded.
Example:
518 ## $aRecorded ca. 1963.
033 00 $a1963----
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