First indicator - Display constant controller

#  Hours

8  No display constant generated

Second indicator:

#  Undefined


a  Hours (NR)

b  Additional information (NR)

6  Linkage (NR)

8  Field link and sequence number (R)

NOTE:  See MARC 21 Format for Bibliographic Data (307 Hours, Etc.) for code definitions not given below.


Field 307 contains chronological information identifying the days and/or times an item is available or accessible.  It is used primarily in records for electronic services.  Field 307 is not appropriate in most serial records.

When displayed or printed as a note, hours, etc. information is in some instances preceded by an introductory term or phrase that is generated based on the first indicator value.

Display constant

The introductory term Hours: may be system generated as a display constant associated with the first indicator value.

Editing instructions


1.   Add a period at the end of the field, unless another mark of punctuation is present.

2.   In subfield $a, use a comma (,) to separate the hours information from the days of the week information.

3.   If subfield $a is followed by a subfield $b, separate by using a semicolon (;).


For records in English, the following abbreviations may be used for the days of the week:

Days of the week
















First indicator - Display constant controller

The first indicator position contains a value that controls the generation of a display constant preceding the note.

#    Hours.

Value "#" specifies that no information is provided.  When no information is provided, the display constant Hours: may be generated.

307 ## M-F, 9:30am-3:30pm, USA EST.

8    No display constant generated.

Value "8" specifies that no display constant is to be generated.

307 8# Date: Dec. 1, 1993, 2:00 p.m.


$a  Hours.

Subfield $a contains information that identifies the days and/or hours an item is available or accessible.  Informal references to the A.M. and P.M. time references and well as time zone can be given in this subfield if required.

307 ## M-F, 9AM-10PM.

307 ## Tu-F, 10-6; Sa, 1-5, USA PST.

307 ## M, 8:30-6:00; Tu, 8:30-7:00; W-F, 8:30-6:00; $b but not available on weekends.

307 8# 8:00 p.m., Tu-F; 5:00 and 9:00 p.m., Sa; 2:00 and 7:00 p.m., Su (all times, EST).

$b  Additional information.

Subfield $b contains additional information pertaining to the hours of availability of the item.

307 ## M-F, 6:30am-9:00pm (EST); $b with brief interruptions for periodic update/backup of data.

307 ## Daily, 7am-7pm; $b text files only.

307 ## M-F, 6:30 AM to 9:30 PM, Sa, 8:00 AM to 5:00 PM, Su, 1:00 PM to 5:00 PM; $b closed on national holidays (all times are EST or ESDT).

$6  Linkage.

For instructions on the use of subfield $6, see field 880.

Related fields, etc.


307 Hours, Etc.  (MARC 21 Format for Bibliographic Data)

See also:

3XX  Physical Description, Etc. Fields

Variable Data Fields

Section E.  MARC 21 Format for Serials as Applied Within CONSER

CONSER Editing Guide:  Contents