It is possible to convert a number to a string by appending .ToString() to the number. Public Function Number.ToString(numb as Double) As String Return numb.ToString() End Function However, you can also add special characters to .ToString("") for additional features. An example of this is teh character "0", this forces numbers to have a minimum number of digits (before or after the decimal point) adding leading/triling zeros when required Dim s As String = (12.34).ToString("000.0000") The value in s would be "012.3400" because the "000.0000" forces 3 digits before the decimal point and 4 digiits after the decimal point. Here are some of the "characters" which can be used to modifidy how .ToString works.
 
(Examples use Thursday 1st July 2021 and 17:08:09)
Note -* .Net will give unexpected results or run-time errors when it encounters .ToString modifiers that are exactly 1 character in length. This is rarely experienced in normal usage because the multiple characters are usually used in combination e.g. .ToString("dd/MM/yyyy") or .ToString("hh:mm:ss").
This is because 1 character .ToString modifiers are assumed to be special format codes (described later.)
If you wish to force .NET to accept a 1 character modifier, there is a workaround. Add a space to the modifier (to make it more than 1 character long) then use .Trim to remove the space from the result. i.e
.ToString("h")   would be replaced by   .ToString("h ").Trim
You should not encounter this problem with empty modifiers or modifiers with more than one character. F -* 0 (1st decimal place seconds 0 = .0) FF - 00 (1st & 2nd decimal place seconds 00 = .00) H -* 17 (Hour 0-23 on 24hr clock) HH - 17 (Hour 00-23 on 24hr clock) K -* Z (Time zone information) {"Z"=UTC,""=unspecified,"+00:00"=offset_hrs:mins} M -* 7 (Month number 1-12) MM - 07 (Month number 01-12) MMM - Jul (Month name abbreviation) MMMM - July (Month name) d -* 1 (day of month 1-31) dd - 01 (day of month 01-31) ddd - Thu (Weekday Abbreviation) dddd - Thursday (Weekday) f -* 0 (1st decimal place seconds 0 = .0) ff - 00 (1st & 2nd decimal place seconds 00 = .00) h -* 5 (Hour 0-12 on 12hr clock) hh - 05 (Hour 00-12 on 12hr clock) m -* 8 (Minute 0-59) mm - 08 (Minute 00-59) s -* 9 (Second 0-59) ss - 09 (Second 00-59) t -* P (A or P {for UK} indicating AM or PM) tt - PM (AM or PM {for UK} indicating AM or PM) y -* 21 (2 digit year 0-99 no leading zero) yy - 21 (2 digit year 00-99) yyyy - 2021 (4 digit year) z -* +1 (Time Zone Offset in hours +/- and 0-12) zz - +01 (Time Zone Offset in hours +/- and 00-12) zzz - +01:00 (Time Zone Offset in hrs:min +/- and 00:00-12:00) / - (Character after / will be inserted into date/time) % - (Character after % is a special character code) " - (Characters within quotes to be inserted into date/time) anything_else (Unrecognised characters to be inserted into date/time) : (Insert : into date/time e.g. "HH:mm" {17:08} ) / (Insert / into date/time e.g. "dd/MM/yyyy" {01/07/2021} ) Special Format Codes D - 01 July 2021 "dd MMMM yyyy" F - 01 July 2021 17:08:09 "dd MMMM yyyy HH:mm:ss" G - 01/07/2021 17:08:09 "MM/dd/yyyy HH:mm:ss" M - 1 July "d MMMM" O - 2021-07-01T17:08:09.0000000 "yyyy-dd-MMTHH:mm:ss.fffffff" R - Thu, 01 Jul 2021 17:08:09 GMT "ddd, dd MMM yyyy HH:mm:ss " {followed by time-zone code} T - 17:08:09 "HH:mm:ss" U - 01 July 2021 16:08:09 "dd MMMM yyyy HH:mm:ss" (This is UTC/GMT time) Y - July 2021 "MMMM yyyy" d - 01/07/2021 "MM/dd/yyyy" f - 01 July 2021 17:08 "dd MMMM yyyy HH:mm" g - 01/07/2021 17:08 "dd/MM/yyyy HH:mm" m - 1 July "d MMMM" {same as "M"} o - 2021-07-01T17:08:09.0000000 "yyyy-dd-MMTHH:mm:ss.fffffff" = same as "O" r - Thu, 01 Jul 2021 17:08:09 GMT "ddd, dd MMM yyyy HH:mm:ss K" = same as "R" s - 2021-07-01T17:08:09 "yyyy-MM-ddTHH:mm:ss" t - 17:08 "HH:mm" u - 2021-07-01 17:08:09Z "yyyy-MM-dd HH:mm:ssK" y - July 2021 "MMMM yyyy" Examples use -1234.56789 {modifiers not case sensitive}
# - If Digit is part or number then use the digit, otherwis pad the number with a leading/trailing space 0 - If Digit is part of number then use the digit, otherwise pad number with a leading/trailing zero ; - Anything before ; applies to +ve numbers, all after ; applies to negative numbers . - Decimal Point to be shown at this position ,. - Divide number by 1000 (,,. = /1000000 etc.) , (not next to .) - show a "thousand separator" in this position C - Use a currency symbol{-£1,234.57} E+ - Use Exponential notation e.g. "00E+00" {-12E+02} E- - The same as E+ but omit the + sign if exponential is positive F - Number of digits after decimal point e.g. "F2" {-1234.57} G - Shortest of F or E+ e.g. "G2" {-1.2E+03} N - Set number of decimal places & add thousand separators e.g. "N2" {-1,234.57} P - Convert to percent with thousand separators e.g. "P2" {-123,456.79%} R - Used to avoid rounding errors in certain circumstances {-1234.56789} \ - Escape charater (Insert next charater into the string, even if it normally has a special meaning) Additional Integer Modifiers
D - Force a minimum number of digits (pad with 0) e.g 1234 "D7" {0001234} This is minimum digits, number will not truncate e.g. -1234 "D2" {-1234} X - Convert to Hex using 0-9 and A-F e.g. 1234 {4D2} Negative numbers give a 2's compliment e.g. -1234 {FFFFFb2e} d - Identical to "D" x - Convert to Hex using 0-9 and a-f e.g. 1234 {4d2} Negative numbers give a 2's compliment e.g. -1234 {fffffb2e}