Milliseconds from Traceheader

[Kurtaja]

Hi everyone,
In the snippet below, I'm able to read the timestamp from the trace header with second-level precision. However, I couldn't find any attributes in TraceField that provide sub-second precision, such as milliseconds or microseconds. I assume there's a way to access this data, but I'm struggling to figure it out. I would appreciate any guidance to help me get past this issue.
...
for iTraceIndex in range(len(segy_file.trace)):
try:
diTraceHeader = segy_file.header[iTraceIndex]
iYear = diTraceHeader[segyio.TraceField.YearDataRecorded]
iDayOfYear = diTraceHeader[segyio.TraceField.DayOfYear]
iHour = diTraceHeader[segyio.TraceField.HourOfDay]
iMinute = diTraceHeader[segyio.TraceField.MinuteOfHour]
iSecond = diTraceHeader[segyio.TraceField.SecondOfMinute]
...
PS: probably evident, but I'm relatively novice to segy.
Kind regards
Kurt

[ajaust]

If you can get better accuracy than seconds depends on the SEG-Y file that you are using, but I am not sure if this accessible.

In SEG-Y rev. 2.1 a new field (byte 141 - 144 of the "SEG-Y Trace Header Extension 1") is defined to add nano seconds to the "Second of minute" value, see SEG-Y rev. 2.1 standard p. 26. However, it is optional to define such an extended trace header. If the header is missing, there is no way to get better accuracy in time. Additionally, the support for these optional headers is, as far as I know, limited or absent in segyio so you might not be able to get this information from segyio.

[ajaust]

We are looking into adding support for the extended trace headers so this feature should be supported in the near future. However, is no concrete timeline for when we expect to have this feature implemented.