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# BIASRANGE

The `BIASRANGE` field specifier (case sensitive) allows you to bias the score of result documents where a specified field contains a date that falls in the inclusive range of two dates that you specify.

NOTE: You can optimize the speed of this field specifier by restricting the field to the property type.

The Content component applies a scoring profile that increases from a minimum date to an optimum range lower value. It has the maximum weight change for values between the optimum lower and optimum upper range values, and then decreases again to a maximum date.

## Format

    FieldText=BIASRANGE{lowerOptimum,upperOptimum,lowerRange,upperRange,percentage}:yourField

`lowerOptimum` | The earliest date that `yourField` can contain to change the weight by the maximum `percentage`. You can specify an open-ended date, by setting this value to a period (`.`).
`upperOptimum` | The latest value that `yourField` can contain to change the weight by the maximum `percentage`. You can specify an open-ended date, by setting this value to a period (`.`).
`lowerRange` | The number of seconds before the `lowerOptimum` to apply a weight change. When `yourField` contains a date that is between (`lowerOptimum`-`lowerRange`) and `lowerOptimum`, Content increases or decreases the weight according to the specified `percentage`, using a linear scale.
`upperRange` | The number of seconds after the `upperOptimum` to apply a weight change. When `yourField` contains a date that is between `upperOptimum` and (`upperOptimum`+`upperRange`), Content increases or decreases the weight according to the specified `percentage`, using a linear scale. NOTE: To use the same value for `lowerRange` and `upperRange`, you can omit this argument.
`percentage` | A percentage in the range -100 to 100. The percentage change to apply to dates that occur in the optimum range. (The boosted relevance score cannot be greater than 100% or less than -100%.) For dates outside the optimum range, but inside the range set by `lowerRange` and `upperRange`, Content adjusts the percentage on a linear scale. When you set to `True`, this value is the absolute value by which to boost the weight and it is then not limited by +/- 100.
`yourField` | The name of the field that must be present, and must contain a value in the specified date range, for the document relevance to be modified.

You can use the following formats to specify your dates:

Date formats

Format | Explanation
--- | ---
`D+/M+/#YY+` | A date. For example, `1/3/05`, `23/12/1999`, `10/07/40`, or `8/5/2012`. If the year is a number less than 40, it is read as a year in the 2000s. If the year is a number between 40 and 99, it is read as a year in the 1900s. For example, `01/02/01` is read as 1 February 2001, and `01/03/40` is read as 1 March 1940. Knowledge Discovery treats the date as a date in its local timezone.
`YYYY-MM-DD` | A date in ISO-8601 format. For example, `2017-05-12`
`HH:NN:SS D+/M+/#YY+` | A time and date. For example, `10:30:45 1/3/05`, `18:55:00 23/12/99`, `01:23:45 10/07/1940`, or `07:15:00 8/5/2012`. If the year is a number less than 40, it is read as a year in the 2000s. If the year is a number between 40 and 99, it is read as a year in the 1900s. For example, `01/02/01` is read as 1 February 2001, and `01/03/40` is read as 1 March 1940. Knowledge Discovery treats the date as a date in its local timezone.
`YYYY-MM-DDTHH:NN:SSZ` `YYYY-MM-DDTHH:NN:SS±HHMM` | A date and time in ISO-8601 formats, with a time zone (either as a literal Z, or a four digit time zone offset). For example, `2017-05-02T12:45:00Z`, or `2017-05-02T12:45:00+0000`.
`HH:NN:SS D+/M+/#YY+ #ADBC` | A time and date with a time period. For example, `10:30:45 1/3/05 AD`, `18:55:00 23/12/99 CE`. For the time period, you can use `AD`, `CE`, `BC`, `BCE`, or any predefined list of EPOCH indicators. Knowledge Discovery treats the date as a date in its local timezone.
`N` | A positive or negative number of days from the current date. For example, `–1` specifies yesterday's date, `0` specifies today's date, `1` specifies tomorrow's date, `2` specifies two days from now (the current date plus two), and so on.
`Ns` | A positive or negative number of seconds from now. For example, `–60s` specifies one minute ago, `–900s` specifies 15 minutes ago, `–3600s` specifies one hour ago and so on. `60s` specifies one minute from now, `900s` specifies 15 minutes from now, `3600s` specifies one hour from now, and so on.
`Ne` | Epoch seconds (seconds since 1 January 1970 UTC). For example, `1012345000e` specifies 22:56:40 on 29 January 2002 UTC.

NOTE: Knowledge Discovery treats any date that does not have explicit timezone information as a date in the local timezone, both in the index and in your query parameters. This behavior might result in non-intuitive matches.

For example, epoch second values are always UTC. The value `1012345000e` matches times as 22:56:40 on 29 January 2002 UTC. If your local timezone is GMT-6, this query might match an indexed date value of 03:56:40 on 29 January 2002 (which corresponds to the same time UTC), because the indexed date is in your local timezone.

Similarly, if your query date is `03:56:40 29/01/2002`, this might match an indexed epoch seconds date of `1012345000`.

## Examples

    BIASRANGE{21/08/2011,25/08/2011,172800,86400,10}:DATE

A document whose `DATE` field value is within the date range 21/08/2011 to 25/08/2011 (inclusive) receives the full weight increase of 10%.

If a date is within 172800s (two days) before 21/08/2011, its weight is increased on a linear scale from 10% if the date is 21/08/2011, to 0% if the date is 19/08/2011. So, if a document has a `DATE` field of 20/08/2011, which is half way in this interval, it is boosted by 0.5*10=5%. Similarly, if a date is within 86400s (one day) after 25/08/2011, its weight is increased on a linear scale from 10% if the date is 25/08/2011, to 0% if the date is 26/08/2011.

    BIASRANGE{21/08/2011,25/08/2011,172800,86400,-10}:DATE

A document whose `DATE` field value is within the date range 21/08/2011 to 25/08/201150 (inclusive) receives the full weight decrease of -10%.

If a date is within 172800s (two days) before 21/08/2011, its weight is decreased on a linear scale from -10% if the date is 21/08/2011, to 0% if the date is 19/08/2011. So if a document has a `DATE` field of 20/08/2011, which is half way in this interval, its score is reduced by 0.5*10=5%. Similarly, if a date is within 86400s (one day) after 25/08/2011, its weight is decreased on a linear scale from -10% if the date is 25/08/2011, to 0% if the date is 26/08/2011.

    BIASRANGE{21/08/2011,25/08/2011,86400,10}:DATE

This example has a single range argument, which means Content uses the same range for the lower and upper ranges.

A document whose `DATE` field value is within the date range 21/08/2011 to 25/08/2011 (inclusive) receives the full weight increase of 10%. If a date is within 86400s (one day) before 21/08/2011, its weight is increased on a linear scale from 10% if the date is 21/08/2011, to 0% if the date is 20/08/2011. Similarly, if a date is within 86400s after 25/08/2011, its weight is increased on a linear scale from 10% if the date is 25/08/2011, to 0% if the date is 26/08/2011.

    BIASRANGE{.,25/08/2011,86400,-10}:DATE

This example uses an open ended range. It modifies the scores for all documents that have a `DATE` field value up to 25/08/2011 (inclusive). If a date is within 86400s after 25/08/2011, its weight is increased on a linear scale from 10% if the date is 25/08/2011, to 0% if the date is 26/08/2011.

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Version 25.4 | Last updated October 2025

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Product: Knowledge Discovery View Component 25.4

Topic Title: BIASRANGE