manual:chapter6:system:cmd_ddays [newRPL User Manual]

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==== DDAYS ====
<callout type="primary" color="" icon="fa fa-book" title="Synopsis">
----
Return number of days between dates
</callout>

<callout color="green" icon="fa fa-indent" title="Stack Diagram">
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^  __Input Stack__  ^^  ^  __Output Stack__  ^
|  **R<sub>date1</sub>**  |  **R<sub>date2</sub>**  |  **→**  |  **I<sub>days</sub>**  |
|  //Level 2//  |  //Level 1//  |  //→//  |  //Level 1//  |

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| **Keyword type**  | [[manual:chapter5:basics#commands|Command]]  ||
| **Parallel list processing capabilities**  | [[manual:chapter5:listproc#group-6two-arguments-one-result-commands|Group 6]]  | //Two arguments, one result commands//  |
| **Affected by flags**  | [[manual:appendix:flags#flag-42|-42]]  | //Date format//  |














</callout>

<callout color="orangered" icon="fa fa-comment" title="Description">
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The ''DDAYS'' command returns the number of days between two dates; if **R<sub>date1</sub>** is chronologically later than **R<sub>date2</sub>** the result is negative. The dates are expressed by a real number and its format depends on the state of flag [[manual:appendix:flags#flag-42|-42]]:

  * if the flag [[manual:appendix:flags#flag-42|-42]] is set the date is expressed as **DD.MMYYYY**;
  * if the flag [[manual:appendix:flags#flag-42|-42]] is cleared the date is expressed as **MM.DDYYYY**.

where:

  * **DD** is the day;
  * **MM** is the month;
  * **YYYY** is the year.

The range of allowable dates is **October 15, 1582** to **December 31, 9999**.
</callout>

<callout type="success" icon="true" title="Compatibility">
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''DDAYS'' is fully equivalent to its **userRPL** counterpart.
</callout>

<callout type="info" icon="true" title="Usage">
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**__Input__**
<code>
4:                                      
3:                                      
2:                             10.081984
1:                             28.111983
…………………………………………………………………………………………………………
-42 SF DDAYS                            
</code>
\\
**__Output__**
<code>
4:                                      
3:                                      
2:                                      
1:                                  -256
…………………………………………………………………………………………………………
                                        
</code>
</callout>

<callout color="darkgray" icon="fa fa-hand-o-right" title="Related Commands">
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