Converting UTC time to seconds

I have a UTC Time stamp on my acquired data in format :

hh:mm:ss.SSSS   

This data is taken at 20 ms and I need it to convert to duration in seconds and make a time series of it taking into account the start time and end time (even milli seconds taken into account)

I am currently using :

Dp = duration(hh,mm:mm,ss:ss);
tp= (minutes(D))*60;

Guidance required to make it into a time series which is generic in way that milli seconds are taken into account as well.

Answer 1

[Steven Lord]

s = '12:34:56.789';
formatSpec = 'hh:mm:ss.SSS';
d = duration(s, 'InputFormat', formatSpec, 'Format', formatSpec)

d = duration
   12:34:56.789

[Yogang Singh]

Thanks !!

The table A comprises of my time data in UTC in the 'hh:mm:ss.SS' format and I have used following script to make the time data into time series in seconds:

Dpt = table2array(A);
formatSpec = 'hh:mm:ss.SS';
dp = duration(Dpt, 'InputFormat', formatSpec, 'Format', formatSpec);
Tp = hours(dp)*3600+(minutes(dp))*60 +seconds(dp);

[Steven Lord]

Just call seconds.

s = '12:34:56.789';
formatSpec = 'hh:mm:ss.SSS';
d = duration(s, 'InputFormat', formatSpec, 'Format', formatSpec)

d = duration
   12:34:56.789

format longg
dInSeconds = seconds(d)

dInSeconds = 
                 45296.789

To check we can perform the calculations manually. To avoid the "magic numbers" 3600 and 60 I use the capability of MATLAB to convert between double and duration arrays.

secondsPerHour = seconds(hours(1)); % 3600
secondsPerMinute = seconds(minutes(1)); % 60
dInSeconds2 = secondsPerHour*12+secondsPerMinute*34+56.789

dInSeconds2 = 
                 45296.789

Looks pretty good to me.