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add duration intermediate type documentation #91

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add duration intermediate type documentation #91

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19 changes: 19 additions & 0 deletions src/documentation/language/datatypes.malloynb
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Expand Up @@ -126,6 +126,25 @@ Ranges may be used in conjunction with the [apply operator](apply.malloynb) to t

In the future, other ranges may be allowed, such as `string` ranges.

### Duration

Durations can be added to timestamps and dates.

* `@2001-02-03 04:05 + 5 minutes`
* `@2001-02-03 04:05 + myHours hours`
* `@2021-01-01 + 5 weeks`
* `@0000-01-01 + myYear years + (daysIntoMyYear - 1) days`

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Thanks for starting this.

A few notes.

  1. Durations can be added or subtracted.
  2. The legal units for durations are, i think, microseconds, milliseconds, seconds, minutes, hours, days, weeks.
  3. SQL durations, if the database has them, are not imported and useful as Malloy durations.

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Done. I added years to your list of legal units 😄

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I also modified point3 for clarity.

A few notes:

1. Durations can be added or subtracted.

2. The legal units for durations are: microseconds, milliseconds,
seconds, minutes, hours, days, weeks, years.

3. SQL durations, if the database has them, are not imported and cannot be used
as Malloy durations.

### Alternations and Partials

_Partials_ represent a "part of" a comparison.
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