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AM is a method of transmitting radio waves that can be used to broadcast sound. AM is an abbreviation for 'amplitude modulation'. Moreover, in situations where the relevant hour is obvious or has been recently mentioned, a speaker might omit the hour and just say "quarter to (the hour)", "half past" or "ten 'til" to avoid an elaborate sentence in informal conversations. These forms are often commonly used in television and radio broadcasts that cover multiple time zones at one-hour intervals. 
Trudgill, Peter (17 May 2020). "Number five-and-twenty: A fading linguistic practice". The New European . Retrieved 13 October 2022.While converting a time in AM to 24 hours, the hours and minutes remain the same. For example, 10 AM remains 10:00. However, when we convert a time in PM to 24 hours, we add 12 hours and remove the units. For example, 3:00 PM becomes, 3:00 + 12 = 15:00 Are 8:00 AM and 8:00 PM the Same?
time of day, elapsed time". Resources of the Language Portal of Canada. 22 October 2020 . Retrieved 27 January 2023.Time". Encyclopædia Britannica. Encyclopædia Britannica Online Library Edition . Retrieved 20 November 2013. The use of AM or PM to designate either noon or midnight can cause ambiguity. (subscription required) For different opinions on representation of midday and midnight, see #Confusion at noon and midnight It is not always clear what times "12:00a.m." and "12:00p.m." denote. From the Latin words meridies (midday), ante (before) and post (after), the term ante meridiem (a.m.) means before midday and post meridiem (p.m.) means after midday. Since "noon" (midday, meridies (m.)) is neither before nor after itself, the terms a.m. and p.m. do not apply.  Although "12m." was suggested as a way to indicate noon, this is seldom done  and also does not resolve the question of how to indicate midnight. In older English, it was common for the number 25 to be expressed as "five-and-twenty".  In this way the time 8:35 may be phrased as "five-and-twenty to 9",  although this styling fell out of fashion in the later part of the 1900s and is now rarely used.