manual:chapter6:system:cmd

Synopsis

Return number of days between dates

Stack Diagram

Input Stack			Output Stack
R_date1	R_date2	→	I_days
Level 2	Level 1	→	Level 1

Legend

Legend	Object type
O	Any object
I	Integer number
R	Real number
#	Binary number
Num	Scalar (Integer, Real or Binary number)
Z	Complex number
U	Unit
∡	Angle
A	Symbolic expression
C	Symbolic constant
V	Vector
M	Matrix
S	String
1/0	Any expression evaluating to True or False
G	Grob
F	Font
D	Binary data container
T	Tag object
L	List
cL	Case list
N	Variable name / Identifier
Dir	Directory
pDir	Packed Directory
P	Program
Lib	Library

Keyword type	Command
Parallel list processing capabilities	Group 6	Two arguments, one result commands
Affected by flags	-42	Date format

Description

The DDAYS command returns the number of days between two dates; if R_date1 is chronologically later than R_date2 the result is negative. The dates are expressed by a real number and its format depends on the state of flag -42:

if the flag -42 is set the date is expressed as DD.MMYYYY;
if the flag -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.

Compatibility

DDAYS is fully equivalent to its userRPL counterpart.

Usage

Input

4:                                      
3:                                      
2:                             10.081984
1:                             28.111983
…………………………………………………………………………………………………………
-42 SF DDAYS

Output

4:                                      
3:                                      
2:                                      
1:                                  -256
…………………………………………………………………………………………………………

Related Commands

Time, Alarms and System Commands 28 1 NEW

Command	Short Description
→DATE	Set current system date in MM.DDYYYY
DATE+	Add days to a date in MM.DDYYYY
→TIME	Set current time as HH.MMSS
→HMS	Convert decimal time to HH.MMSS
HMS→	Convert time in HH.MMSS to decimal
HMS+	Add time in HH.MMSS format
HMS-	Subtract time in HH.MMSS format
TICKS	Return system clock in microseconds	CHANGED
TEVAL	Perform EVAL and measure elapsed time	CHANGED
DATE	Current system date as MM.DDYYYY
DDAYS	Number of days between dates in MM.DDYYYY
TIME	Current time in HH.MMSS
TSTR
ACK	Acknowledge oldest alarm (dismiss)
ACKALL	Acknowledge (dismiss) all alarms
RCLALARM	Recall specified alarm
STOALARM	Create a new alarm
DELALARM	Delete an existing alarm
FINDALARM	Get first alarm due after the given time
VERSION	Get newRPL version string
MEM	Get available memory in bytes
BYTES	Size of an object in bytes and CRC32	CHANGED
PEEK	Low-level read memory address	CHANGED
POKE	Low level write to memory address	CHANGED
NEWOB	Make a new copy of the given object
GARBAGE	Force a garbage collection	NEW
FWUPD
OFF	Turn calculator off programmatically