==== DDAYS ====
----
Return number of days between dates
----
^ __Input Stack__ ^^ ^ __Output Stack__ ^
| **Rdate1** | **Rdate2** | **→** | **Idays** |
| //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// |
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The ''DDAYS'' command returns the number of days between two dates; if **Rdate1** is chronologically later than **Rdate2** 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**.
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''DDAYS'' is fully equivalent to its **userRPL** counterpart.
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**__Input__**
4:
3:
2: 10.081984
1: 28.111983
…………………………………………………………………………………………………………
-42 SF DDAYS
\\
**__Output__**
4:
3:
2:
1: -256
…………………………………………………………………………………………………………
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