The date and time are automatically updated when the iHealth Edge is connected to your smartphone.
If you have not used your iHealth Edge for a long time and/or the battery has been completely discharged, you must synchronize your iHealth Edge with your smartphone to update the date and time.
*credit to Sylvain of iHealth Labs EU
https://helpcenter.ihealthlabs.eu/hc/en-gb/articles/212032385-iHealth-Edge-AM3S-How-to-set-up-the-date-and-time-