for i in range(0,len(time)-1):

    if time[i+1] > time[i]:
        elapsed_time.append(time[i])
    else:
        tr = time[i]
        t1 = tr + 1e-3 # add 1 millisecond to keep both values..
        elapsed_time.append(tr)
        elapsed_time.append(t1)
        while time[i+1] > time[i]:
              t2 = time[i] + tr
              elapsed_time.append(t2)