Regarding reading and writing HDF5 files

General
1

Hello everyone!
I am trying to obtain the timestamp associated with the HDF5 file (in the function readHDF5Files) in Fenics 2019.1.0

// A function that writes HDF5 files:
def output_state(mesh,var,fname,t):
    ff=HDF5File(mesh.mpi_comm(),fname + '.h5', 'w')
    ff.write(mesh,'mesh') 
    ff.write(var,'var',t)
    ff.close()

def get_space(mesh):
    Q = FiniteElement("Lagrange", mesh.ufl_cell(), 1)
    V = VectorElement("Lagrange", mesh.ufl_cell(), 2)
    W = FunctionSpace(mesh,MixedElement([V,Q,Q,Q,Q]))
    
    return W

/* Reading of HDF5 files*/
def readHDF5Files(filePath):
    mesh = Mesh()
    f=HDF5File(mesh.mpi_comm(),filePath, 'r')
    f.read(mesh,"mesh",False)   
    var = Function(get_space(mesh))
    f.read(var,"var")
    u,p,c,q,phi = var.split(True)
    return u

Until now I have been saving HDF5 files based on iteration numbers (iterations in the loop: for eg., state100.h5, state200.h5 …) and the time step for the simulation is fixed. However I am now using variable time steps and I want to obtain the timestamp associated with the quantity being returned by the function readHDF5Files.

Any insights or leads would highly be appreciated.