FIX Data Type TZTimestamp
string field representing a time/date combination representing local time with an offset to UTC to allow identification of local time and timezone offset of that time. The representation is based on ISO 8601.
Format is YYYYMMDD-HH:MM:SS[Z [ + - hh[:mm]]] where YYYY = 0000 to 9999, MM = 01-12, DD = 01-31 HH = 00-23 hours, MM = 00-59 minutes, SS = 00-59 seconds, hh = 01-12 offset hours, mm = 00-59 offset minutes
Example: 20060901-07:39Z is 07:39 UTC on 1st of September 2006
Example: 20060901-02:39-05 is five hours behind UTC, thus Eastern Time on 1st of September 2006
Example: 20060901-15:39+08 is eight hours ahead of UTC, Hong Kong/Singapore time on 1st of September 2006
Example: 20060901-13:09+05:30 is 5.5 hours ahead of UTC, India time on 1st of September 2006
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For example if you were writing a clarification on how to specify the "quantity" of an order in FIX, you might add the following relevant link, http://www.fixprotocol.org/discuss/read/f5014573, to back up your points.