error: use of undeclared identifier "classname"

I am trying to implement a class "Time". I have put all the declarations in Time.h and the implementations in Time.cpp. Then I am testing it in a seperate file Test.cpp. When compiling the Time.cpp file, I am getting this error, error: use of undeclared identifier 'Time'. Here is the code,

Time.h

#ifndef _TIME_H_
#define _TIME_H_

#include <iostream>

class Time
{
    public:
        Time();
        
        // extra constructor not provided in part 3
        Time(int hour, int min = 0, int h = 0);
        
        void setTime(int h, int m, int s);

        Time operator+(unsigned int n) const;
        Time& operator+=(unsigned int n);
        Time& operator++(); // prefix version
        Time operator++(int n); // postfix version

        // member functions you have to implement
        bool operator==(const Time &t) const;
        bool operator!=(const Time &t) const;
        bool operator<(const Time &t) const;
        bool operator<=(const Time &t)const;
        Time operator-(unsigned int n) const; 
        Time& operator-=(unsigned int n);
        Time& operator--(); // prefix version
        Time operator--(int n); // postfix version

        int getHour() const;
        int getMin() const;
        int getSec() const;

        
    private:
        int hour, min, sec;

        // output in universal format
        friend ostream& operator<<(ostream& o, const Time& t);

        // new friend functions you have to implement
        friend bool operator>(const Time& t1, const Time& t2);
        friend bool operator>=(const Time& t1, const Time& t2);
        friend int operator%(const Time& t1, const Time& t2);
};

#endif

Time.cpp

#include <iostream>
#include <iomanip>
#include <cmath>
#include "Time.h"

using namespace std;

Time::Time()
{
    hour = min = sec = 0;
}

Time::Time(int h, int m, int s)
{
    setTime(h, m, s);
}

void Time::setTime(int h, int m, int s)
{
    hour = (h>=0 && h<24) ? h : 0;
    min = (m>=0 && m<60) ? m : 0;
    sec = (s>=0 && s<60) ? s : 0;
}

int Time::getHour() const
{
    return hour;
}

int Time::getMin() const
{
    return min;
}

int Time::getSec() const
{
    return sec;
}

Time& Time::operator+=(unsigned int n)
{
    sec += n;
    if (sec>=60)
    { 
        min += sec/60;
        sec %= 60;
        if (min>=60)
        {
            hour = (hour + min/60)%24; 
            min %= 60;
        }
    }
    return *this;
}

Time& Time::operator-=(unsigned int n)
{
    sec -= n;
    if (sec < 0)
    {
        min -= ceil((sec * (-1)) / 60.0);
        sec %= 60;
        if (sec < 0)
        {
            sec += 60;
        }
        if (min < 0)
        {
            hour -= ceil((min * (-1)) / 60.0);
            min %= 60;
            if (min < 0)
            {
                min += 60;
            }
        }
    }
    return *this;
}

Time Time::operator+(unsigned int n) const
{
    Time tCopy(*this);
    tCopy += n;
    return tCopy;
}

Time Time::operator-(unsigned int n) const
{
    Time tCopy(*this);
    tCopy -= n;
    return tCopy;
}

Time& Time::operator++()  // prefix version
{
    *this += 1;
    return *this;
}

Time& Time::operator--()  // prefix version
{
    *this -= 1;
    return *this;
}

Time Time::operator++(int n)   // postfix version
{
    Time tCopy(*this);
    *this += 1;
    return tCopy;
}

Time Time::operator--(int n)   // postfix version
{
    Time tCopy(*this);
    *this -= 1;
    return tCopy;
}

bool Time::operator==(const Time &t) const
{
    if(hour == t.getHour() && min == t.getMin() && sec == t.getSec())
    {
        return true;
    }
    return false;
}

bool Time::operator!=(const Time &t) const
{
    if(*this == t)
    {
        return false;
    }
    return true;
}

bool Time::operator<(const Time &t) const
{
    if(hour < t.getHour() || min < t.getMin() || sec < getSec())
    {
        return true;
    }
    return false;
}

bool Time::operator<=(const Time &t)const
{
    if(*this < t || *this == t)
    {
        return true;
    }
    return false;
}

ostream& operator<<(ostream& o, const Time &t)
{
    o << setfill('0') << setw(2) << t.hour << ":" << setw(2) << t.min << ":" << setw(2) << t.sec;
    return o;
}

bool operator>(const Time& t1, const Time& t2)
{
    if(t1 < t2 || t1 == t2)
    {
        return false;
    }
    return true;
}

bool operator>=(const Time& t1, const Time& t2)
{
    if(t1 < t2)
    {
        return false;
    }
    return true;
}

int operator%(const Time& t1, const Time& t2)
{
    int totalSec = 24 * 60 * 60;
    int earlyTime = (t1.getHour() * 3600) + (t1.getMin() * 60) + (t1.getSec());
    int lateTime = (t2.getHour() * 3600) + (t2.getMin() * 60) + (t2.getSec());
    if(earlyTime <= lateTime)
    {
        return lateTime - earlyTime;
    }
    else
    {
        return (totalSec - earlyTime) + lateTime;
    }
}

Screenshot of Error

What is wrong in the code?