1   Uma das formas mais comuns de dizer as horas é:

 
 

O'CLOCK		HALF PAST
6.00	six o'clock	6.30	half past six
7.00	seven o'clock	7.30	half past seven
8.00	eight o'clock	8.30	half past eight
9.00	nine o'clock	9.30	half past nine

 
 
 

A QUARTER PAST		A QUARTER TO
6.15	a quarter past six	6.45	a quarter to seven
7.15	a quarter past seven	7.45	a quarter to eight
8.15	a quarter past eight	8.45	a quarter to nine
9.15	a quarter past nine	9.45	a quarter to ten

 
 
 

PAST		TO
6.05	five past six	6.35	twenty-five to seven
7.10	ten past seven	7.40	twenty to eight
8.20	twenty past eight	8.50	ten to nine
9.25	twenty-five past nine	9.55	five to ten

 
 
 

MINUTES PAST		MINUTES TO
6.07	seven minutes past six	6.36	twenty-four minutes to seven
7.12	twelve minutes past seven	7.41	nineteen minutes to eight
8.23	twenty-three minutes past eight	8.48	twelve minutes to nine
9.28	twenty-eight minutes past nine	9.57	three minutes to ten

 
 
 

2   Em linguagem informal, as palavras o'clock e past (este último de half past) são por vezes omitidas:
O'CLOCK
The film starts at one.	O filme começa à uma.
He's coming at eight.	Ele vem às oito.
PAST   (de HALF PAST)
It's half six.	São seis e meia.
He's coming at half ten.	Ele vem às dez e meia.

 
 
 

3   Em inglês americano, after é frequentemente empregue em vez de past (mas não half past) e of, por vezes, em lugar de to:
6.05	five after six	6.35	twenty-five of seven
6.10	ten after six	6.40	twenty of seven
6.15	a quarter after six	6.45	a quarter of seven
6.20	twenty after six	6.50	ten of seven
6.25	twenty-five after six	6.55	five of seven

 
 
 

4   A outra forma bastante comum de dizer as horas é:

 
 

6.00	six o'clock	6.30	six thirty
6.05	six oh five	6.35	six thirty-five
6.10	six ten	6.40	six forty
6.15	six fifteen	6.45	six forty-five
6.20	six twenty	6.50	six fifty
6.25	six twenty-five	6.55	six fifty-five

 
 
 

5   Se necessitar de especificar a hora do dia, utilize in the morning, in the afternoon, in the evening, ou at night :
one (o'clock) in the morning	uma (hora) da manhã
one (o'clock) in the afternoon	uma (hora) da tarde
eight (o'clock) in the evening	oito (horas) da noite
eight (o'clock) at night	oito (horas) da noite

 
 
 

6   Se necessitar de especificar a hora do dia em contextos formais, utilize a.m. (ou am), ou p.m. (ou pm) :
onde a.m. = ante meridiem (latim) = entre 0 e 12 horas e p.m. = post meridiem (latim) = entre 12 e 24 horas
1.00 a.m.		one in the morning	uma da manhã
1.00 p.m.		one in the afternoon	uma da tarde
8.00 a.m.		eight in the morning	oito da manhã
8.00 p.m.		eight in the evening	oito da noite
12.00 a.m.		midday / noon	meio-dia
12.00 p.m.		midnight	meia-noite
Note que a.m. e p.m. baseiam-se no sistema de 12 horas.

 
 
 

7   Em inglês, o sistema de 24 horas é empregue em horários de transportes, comunicados oficiais, horários militares, etc.:

 
 

06.05	six oh five	18.05	eighteen oh five
09.15	nine fifteen	21.15	twenty-one fifteen
11.20	eleven twenty	23.20	twenty-three twenty

 
 
 

8   Em horários militares, também emprega-se a expressão hundred hours quando as horas terminam em dois zeros, isto é, zero minutos:

 
 

0600	oh six hundred hours	1800	eighteen hundred hours
0900	oh nine hundred hours	2100	twenty-one hundred hours
1200	twelve hundred hours	2400	twenty-four hundred hours