Validation not works properly if timestep was given in hours or days

[nishanthvasu]

Hi, @johnnymongiat

If i give timestep as hours or days by converting to milliseconds, it was not validating properly(For example if i generate otp ar today 8 Am and it was expiring at day after tomorrow 5:30 AM (GMT time)) and also it takes the time zone calculation as well. Request you to update the code in this issue. I have used HMACSHA512 algorithm with 6 digits. Let me know if you guys have any thoughts on this @SaltOfTheFlame @gaviral

Thanks in advance.