Adding timestamps in an LVM file

Hello,

I am acquiring a analog signal using one channel of DAQ pad and saving them using 'write to measurment.vi' by setting its properties as 1)Header-one header only 2)X value(Time) coulmn as one column per channel.The saved file has the data format as this

X_Value Voltage Comment
0.000000 0.000305
0.010000 0.000000
0.020000 0.002747
0.030000 0.001526
0.040000 0.001373

can someone provide of how to add hours,minutes,seconds to the saving file.(If possible some example)

Thanks.