Bird Banding Laboratory


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Inexact Date Codes

These codes are used primarily when exact dates cannot be obtained. Banders should rarely need to use them.

Month Inexact Codes
CODE DESCRIPTION EXAMPLE
82
Summer (06/21/YY thru 09/21/YY)
82/99/YY
83
Spring (03/20/YY thru 06/20/YY)
83/99/YY
92
Winter (12/21/YY-1 thru 03/19/YY)
92/99/YY
93
Fall (09/22/YY thru 12/20/YY)
93/99/YY
94
Hunting Season (09/01/YY thru 03/31/YY+1)
94/99/YY
99
Unknown month and day of banding or encounter
99/99/YY

 

Day Inexact Codes
CODE DESCRIPTION EXAMPLE
41
1st ten days in month
MM/41/YY
42
2nd ten days in month
MM/42/YY
43
3rd ten days in month
MM/43/YY
45
encountered during special hunting seasons
MM/45/YY
51-81*
Encounter letter date or postmark date (plus 50)
**
99
Unknown day of banding or encounter
MM/99/YY

* 50 is added to the postmark date or the date the encounter letter is received or processed at the BBL because no encounter date was provided or the reporter stated they did not know when the bird was encountered.

** For example, the date code 12/65/1970 indicates a letter from the finder had a postmark of 12/15/1970 but they did not include an encounter date.