.
Converting from AM/PM to UTC
for both standard and daylight saving time

Standard Time:
When converting to Coordinated Universal Time (UTC), the local AM/PM time must be converted to a 24-hour clock. Then, use the chart below to convert to UTC.

From Local Time to UTC:
 Eastern Standard Time (EST) EST + 5 hours = UTC Central Standard Time (CST) CST + 6 hours = UTC Mountain Standard Time (MST) MST + 7 hours = UTC Pacific Standard Time (PST) PST + 8 hours = UTC

Some Examples:
Local Date AM/PM Time 24 Hour Clock UTC Time UTC Date May 2nd 9:59 AM (EST) 959 (EST) 1459 May 2nd May 2nd 1:00 PM (EST) 1300 (EST) 1800 May 2nd May 2nd 6:00 PM (EST) 1800 (EST) 2300 May 2nd If the UTC time is greater than 2359, then you have crossed over to the next day. So for example, 2430 becomes 0030 the day after. May 2nd 6:00 PM (CST) 1800 (CST) 0000 May 3rd May 2nd 6:00 PM (MST) 1800 (MST) 0100 May 3rd May 2nd 6:00 PM (PST) 1800 (PST) 0200 May 3rd

Daylight Saving Time:
When converting from Daylight Saving Time to UTC, the conversions are similar but the UTC Time is one hour less than when converting than its Standard Time counterpart. Local AM/PM time must be converted to a 24-hour clock. Then, use the chart below to convert to UTC.

From Local Daylight Saving Time to UTC:
 Eastern Daylight Time (EDT) EDT + 4 hours = UTC Central Daylight Time (CDT) CDT + 5 hours = UTC Mountain Daylight Time (MDT) MDT + 6 hours = UTC Pacific Daylight Time (PDT) PDT + 7 hours = UTC

Some Examples:
Local Date AM/PM Time 24 Hour Clock UTC Time UTC Date May 2nd 9:59 AM (EDT) 959 (EDT) 1359 May 2nd May 2nd 1:00 PM (EDT) 1300 (EDT) 1700 May 2nd May 2nd 6:00 PM (EDT) 1800 (EDT) 2200 May 2nd May 2nd 6:00 PM (CDT) 1800 (CDT) 2300 May 2nd If the UTC time is greater than 2359, then you have crossed over to the next day. So for example, 2430 becomes 0030 the day after. May 2nd 6:00 PM (MDT) 1800 (MDT) 0000 May 3rd May 2nd 6:00 PM (PDT) 1800 (PDT) 0100 May 3rd

24 hour clock
 Terms for using data resources. CD-ROM available. Credits and Acknowledgments for WW2010. Department of Atmospheric Sciences (DAS) atthe University of Illinois at Urbana-Champaign.

utc to am/pm