Adverb
according to the clock
Source: WordNetit's three o'clock in Tokyo now Source: Internet
About two o'clock in the morning he is awakened by a severe pain in the great toe; more rarely in the heel, ankle or instep. Source: Internet
After three o'clock in the afternoon (the time at which Jesus is traditionally believed to have died), the faithful venerate the cross in the local church and follow the procession of the Burial of Jesus. Source: Internet
After lunch, there is usually 4 o'clock tea (afternoon tea), which is served before dinner. Source: Internet
A curved device called a finger stop sits above the dial at approximately the 4 o'clock position. Source: Internet
After the hour of vespers, between six and seven o'clock a fever appeared and remained permanently. Source: Internet