Question

I have a date in this format dd/m/yyyy (if the month is less than 10) that i want to convert to this one dd/mm/yyyy no matter what is the value of the month.

thanks.

Answer 1

Here’s a simple solution if you know the string is in the exact format you’ve posted:

s = s.replace(/\/(\d)\//, '/0$1/');

Of course, you may want to check for d/m/yyyy, or d/mm/yyyy.

Another option, in that case, is:

s = s.replace(/\b\d\b/g, '0$&');

Again, assuming the date is the whole string, and not partial in it. The pattern reads:

• \b\d\b – A digit that is a whole word (wrapped by non-alphanumeric characters or the edge of the string)
• /g – Global replace, as we may have two matches.
• 0$& – Add a zero to the whole match.