Hi, I have checked the requirements you want carefully.
As you will see, I have more than 5 years of hands-on experience efficiently coding websites and applications using modern HTML5, CSS3 and Javascript.
Throughout my career, I have been acknowledged as a solution-focused professional with the ability to design and develop innovative applications using advanced technologies.
While I was building websites, I have used not only pure HTML5/CSS3 and Javascript, but also modern CSS frameworks such as Bootstrap, Tailwind, Bulma and Javascript frameworks such as jQuery, React, Angular and Vue and so on.
I can copy javascript countdown timer from an existing website perfectly within a short time as you want.
Looking forward to fearing from you soon.
Best regards.
Them Ho.