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How can I search for content by date using the DT field code?

The DT field code allows for flexible searching of content based on a specific point in, or period of, time.  For example, researchers can use it to find content recently published in the last week, last month or last year. It's simple; use the DT field code followed by the number of days you want to search. The following applications of the DT field code are respected by the search engine:

1. Relative date search by days

One-digit, two-digit, or three-digit numbers are interpreted as days. The date range searched is relative to the date of the search plus or minus a number of days. You can extend or shorten the date range by entering larger or smaller numbers after the DT field code.

Search term Interpretation
DT 7 Find content published in the last 7 days (past week)
DT 30 Find content published in the last 30 days (past month)
DT 90 Find content published in the last 90 days (past quarter)
DT 365 Find content published in the last 365 days (past year)
DT 999 Find content published in the last 999 days

 

2. Relative date search by year

Four-digit numbers are interpreted as years. This means you can search for content published in a specific year by entering the DT field code followed by the four-digit year.

Search term Interpretation
DT 1984 Find content published in the year 1984
DT 2001 Find content published in the year 2001

 

3. Relative date search from days in past to days in future

You can also search a range of relative dates from the past into the future by using a hyphen between number of days. (Some publications have "published" dates in the future. For instance a monthly magazine that comes out this month but has a cover date of next month.)

Search term Interpretation
DT 30-30 Find content published in the last 30 days to future 30 days
DT -30 Find content published from today up to 30 days in the future

 

4. Specific date search

As always, you can also search for content published on a specific date or within a specific range of dates by entering the full date in yyyymmdd format after the DT field code.

Search term Interpretation
DT 19690721 Find content published on July 21, 1969
DT 19140628-19140823 Find content published from June 28, 1914 -- August 23, 1914

 

5. Combining Search terms AND Dates

You can combine the DT search string with your search terms for precise searching of content. (Use uppercase "AND" to combine search terms.)

Search term Interpretation
hubble telescope AND DT 7 Find content about the Hubble telescope published in the last 7 days
hubble telescope AND DT 30-30 Find content about the Hubble telescope published in the last 30 days to future 30 days
hubble telescope AND DT 19900424 Find content about the Hubble telescope published on April 4, 1990
hubble telescope AND DT 19940101-19940131 Find content about the Hubble telescope published from January 1, 1994 -- January 21, 1994

 

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