  We report the multi-wavelength study for a high-synchrotron-peaked BL Lac 1ES
1218+304 using near-simultaneous data obtained during the period from January
1, 2018, to May 31, 2021 (MJD 58119-59365) from various instruments including
Fermi-LAT, Swift-XRT, AstroSat, and optical from Swift-UVOT $\&$ TUBITAK
observatory in Turkey. The source was reported to be flaring in TeV
$\gamma$-ray band during 2019, but no significant variation is observed with
Fermi-LAT. A sub-hour variability is seen in the SXT light curve, suggesting a
compact emission region for their variability. However, hour scale variability
is observed in the $\gamma$-ray light curve. A "softer-when-brighter" trend is
observed in $\gamma$-rays, and an opposite trend is seen in X-rays suggesting
both emissions are produced via two different processes as expected from an HBL
source. We have chosen the two epochs in January 2019 to study and compare
their physical parameters. A joint fit of SXT and LAXPC provides a constraint
on the synchrotron peak, roughly estimated to be $\sim$1.6 keV. A clear shift
in the synchrotron peak is observed from $\sim$1 keV to above 10 keV revealing
its extreme nature or behaving like an EHBL-type source. The optical
observation provides color-index variation as "blue-when-brighter". The
broadband SED is fitted with a single-zone SSC model, and their parameters are
discussed in the context of a TeV blazar and the possible mechanism behind the
broadband emission.
