by xz-Bit (3 Submissions)
Category: String Manipulation
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Fri 28th September 2001
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
a comprehensive way to validate if a user imput a valid time format. '1. identify structure '2. trace spaces '3. read input characters
VBcoders
'place a command button and a text box
'paste this code either on text box event procedure(e.g. text1_lostfocus())
Private Sub Command1_Click()
dim i
if trim(text1) <> "" then
if (mid(text1,3,1)=":" and mid(text1,6,1)=":") and mid(text1,9,1)=" " and (mid(ucase(text1),10,2) = "AM" or mid(text1,10, 2) ="PM" then
'meet valid tie format
'validate hh not > 12
if mid(text1,1,2) > 12 then
msgbox"Number of hours exceed",,"Error"
end if
'validate mm not 59
if mid(text1,4,2) > 59 then
msgbox"Number of minutes exceed",,"Error"
end if
'validate ss not > 59
if mid(text1,7,2) > 59 then
msgbox"Number of seconds exceeds",,"Error"
end if
'validate if input string are valid in format
'8 represents the maximum value of text box
for i = 1 to 8
if instr("0123456789:", mid(text1,i,1) = false then
msgbox"Undentified string.",,"Error"
exit for
end if
next i
'empty value
else
msgbox"Invalid time format",,"Error"
end if
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