  The Hubble tension is one of the most relevant unsolved problems in cosmology
today. Strongly gravitationally lensed transient objects, such as strongly
lensed supernovae, are an independent and competitive probe that can be used to
determine the Hubble constant. In this context, the time delay between
different images of lensed supernovae is a key ingredient. We present a method,
to retrieve time delays and the amount of differential dust extinction between
multiple images of lensed type IIP supernovae through their color curves, which
display a kink in the time evolution. With multiple realistic mock color curves
based on an observed unlensed supernova from the Carnegie Supernova Project, we
demonstrate that we can retrieve the time delay with uncertainties of $\pm$1.0
days for light curves with 2-day cadence and 35% missing data due to weather
losses. The differential dust extinction is more susceptible to uncertainties,
because it depends on imposing the correct extinction law. Further we also
investigate the kink structure in the color curves for different rest-frame
wavelength bands, particularly rest-frame UV light curves from SWIFT, finding
sufficiently strong kinks for our method to work for typical lensed SN
redshifts that would redshift the kink feature to optical wavelengths. With the
upcoming Rubin Observatory Legacy Survey of Space and Time, hundreds of
strongly lensed supernovae will be detected and our new method for lensed SN
IIP is readily applicable to provide delays.
