How can I get the date & time from the network provider?

You may need to use a custom NITZ or NTP Library

So just a heads up that Android uses NITZ events provided by a carrier
to properly set the system date and time. Android also falls-back to
network NTP automatically when no cellular network is available.

http://en.wikipedia.org/wiki/NITZ

The time provided by currentTimeMillis() will typically be the best
available time, and it’s what all of the services on the device use,
like Calendar and Alarm Clock.

However

However the NTP API isn’t somewhere that Java code can access, which
means we’re back to using an existing Java NTP/SNTP client library if
we want an accurate time regardless of whether we are on a network
that is NITZ capable.

Java NTP library

You can find a naive implementation of a Java NTP Library from

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