Solved

How do I calculate time 4 hours ago in vbs or batch

Posted on 2006-10-26
7
565 Views
Last Modified: 2012-06-21
I need to calculate the time 4 hours ago in a batch file or vbs and set it to a system variable.

Time now is 0900
fourHoursAgo = 0500

time now is 0200
fourHoursAgo = 2200
0
Comment
Question by:brian_appliedcpu
  • 3
  • 2
  • 2
7 Comments
 
LVL 1

Expert Comment

by:nicolasn
ID: 17812313
Hello Brian,

The code below will popup a message with the time four hours ago in the format you are looking for.  Tell us a little more about the "system variable" part though... Do you mean an enviroment variable?

Nicolas Noakes

***** CODE BELOW ****

Function Pad(s,l,c)
's = String to pad (with prefix)
'l = Target length
'c = Character to pad with
Dim p
Dim i
  p = s
  Do While Len(p) < l
    p = c & p
  Loop
  Pad = p
End Function

'You can use the following units:
'y = year
'm = month
'd = day
'h = hour
'n = minute
's = second

TgtTime = DateAdd("h", -4, Now())

MsgBox Pad(Hour(TgtTime), 2, "0") & Pad(Minute(TgtTime), 2, "0")
0
 
LVL 2

Author Comment

by:brian_appliedcpu
ID: 17812538
Yes, I apologize...

We have a script that calculates the hour as shown below but I need something that can subtract 4 hours from it and set it as an environment variable.

' from the  RunNow.vbs file in the question above, modified to display instead of setting:
Wscript.echo "set YY=" & Right("0" & Year(now()), 2)
Wscript.echo "set MM=" & Right("0" & Month(now()), 2)
Wscript.echo "set DD=" & Right("0" & Day(now()), 2)
Wscript.echo "set Hour=" & Right("0" & Hour(now()), 2)
Wscript.echo "set Min=" & Right("0" & Minute(now()), 2)
Wscript.echo "set Sec=" & Right("0" & Second(now()), 2)
Wscript.echo "set Now=%Hour%-%Min%-Hours"
'  continue the rest


Thanks
0
 
LVL 1

Expert Comment

by:nicolasn
ID: 17812959
To subtract 4 hours, set a variable (TgtTime in my first post) to the current time less 4 hours by using the vbscript DateAdd function as follows:

TgtTime = DateAdd("h", -4, now())   'This will set TgtTime to the current time less 4 hours

Now replace every instance of now() in your script with TgtTime to make it use the 4-hours-ago time.

I'll have to get back to you re the environment variable part...

Nicolas
0
Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

 
LVL 2

Author Comment

by:brian_appliedcpu
ID: 17813601
Not quite sure what I am doing wrong...

Wscript.Echo "set h= " & DatePart("h", now)
Wscript.echo "set TgtTime=" & DateAdd("h", -4, now())

Wscript.echo "set HSub4=" & Right("0" & Hour(TgtTime), 2)
Wscript.echo "set MSub4=" & Right("0" & Minute(TgtTime), 2)
Wscript.echo "set SSub4=" & Right("0" & Second(TgtTime), 2)

Wscript.Echo "set TgtHour= " & DatePart("hour", TgtTime)
Wscript.echo "set TgtHour=%TgtHour%"


Here is the output  ALL 00   ?????

F:\bin>set h= 13

F:\bin>set TgtTime=10/26/2006 9:20:33 AM

F:\bin>set HSub4=00

F:\bin>set MSub4=00

F:\bin>set SSub4=00
0
 
LVL 4

Expert Comment

by:mattcarver
ID: 17814458
TimeNow=now()
TgtTime=DateAdd("h",-4, TimeNow)

Wscript.Echo "set h= " & DatePart("h", TimeNow)
Wscript.echo "set TgtTime=" & TgtTime
Wscript.echo "set HSub4=" & Right("0" & DatePart("h",TgtTime), 2)
Wscript.echo "set MSub4=" & Right("0" & DatePart("m",TgtTime), 2)
Wscript.echo "set SSub4=" & Right("0" & DatePart("s",TgtTime), 2)

Wscript.Echo "set TgtHour= " & DatePart("h", TgtTime)
0
 
LVL 4

Accepted Solution

by:
mattcarver earned 250 total points
ID: 17814487
I posted the working version above.  What you were doing wrong was trying to use TgtTime but TgtTime was never set "in VBS/WSH".  

The following line would set a variable in the context of a batch file but not for VBS/WSH.
Wscript.echo "set TgtTime=" & DateAdd("h", -4, now())
0
 
LVL 2

Author Comment

by:brian_appliedcpu
ID: 17814494
Excellent...
0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
word0 challenge 3 90
wordmultiple challenge 12 131
how to use laptop or pad camera in vb.net windows application 2 70
VB.net and sql server 4 33
This article will show, step by step, how to integrate R code into a R Sweave document
A short article about a problem I had getting the GPS LocationListener working.
In this fourth video of the Xpdf series, we discuss and demonstrate the PDFinfo utility, which retrieves the contents of a PDF's Info Dictionary, as well as some other information, including the page count. We show how to isolate the page count in a…
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now