HI,
After Googling I came to know that, SP Rest api provides end point to retrieve Time Zone settings.
<site url>+ _api/web/RegionalSettings/TimeZone
offset = (data.d.Information.Bias + data.d.Information.DaylightBias) / 60.0
new Date( new Date().getTime() - offset x 3600 x 1000)
but the time I am getting not exactly matching.
Please suggest.