This shield provides an RTC function for time information. With the built-in battery mounted on the shield, it maintains the time information even when the power is turned off.
Because of the built-in battery charging system, the battery is charged whenever the power is connected to the shield. However, if you do not connect power to shield for a long period (about 30 days in full-charged), the battery is discharged and time information may be initialized.
Connect to the web setup page of shield.
Move to the SETUP page.
Click the [TIME SYNC.] on the [TIME] tap.
Check the [PHPoC Shield Time] is synchronized with the [Host Local Time].