Redgarding to block entries for a scheduled time

Heloo Experts,

How to block the sales voucher entry for a certain period of time??
For eg., I need to control the entries from eve 8 to morng 8 .....I have tried on basic code given below..whick is working gud for a from time input but how to add that sceduled time of From time and To time....
any experts give me any ideas/suggestions pls.....

[#Form:salescolor]
Control:$$String:$$MachineTime="18:00"

 

Gud morning sir,
And am really sry as I couldn't get ur suggestion properly sir....I really got stuck on the code I have used above...and dont have any idea what to do nxt....
Can u plz jst explain me once again how does the scheduled time work....else automatically without using udf's how to control the sales entry between the two times of (evng 8 pm To morning 8 Am ) everyday sir...
If the udf's is must if I create two fields one for FROM time another for TO time..thn how to combine the field in [#form:salescolor] sir

 

use following code for your reference set time as 24 hours clock

Code:

[#Report:Voucher]
    Set:vchLockStrTime:"16:00"
    Set:vchLockEndTime:"20:00"
  
  
[#Form:Voucher]
    On:Form Accept:Yes:Form Accept
    Add:Control:IsintimeCtr:@@IsTimePass
  
  
[System:Formula]
    IsTimePass: $$Time:$$MachineTime >  ##vchLockStrTime and  $$Time:$$MachineTime <  ##vchLockEndTime
    IsintimeCtr:"Not allowed any entries within time from "  + $$String:##vchLockStrTime + " to  " + $$String:##vchLockEndTime
  

[Variable:vchLockStrTime]
    Type:Time
    Persistent : Yes
  
[Variable:vchLockEndTime]
    Type:Time
    Persistent : Yes
  

[System:Variable]
    vchLockStrTime:"21:00"
    vchLockEndTime:"06:00"

 

thank you sir...its working fine...

 

Thank you sir

 

@narayane88 sir proper not work in tally erp