Change HIDPowerDevice_::sendDate to send the date as a FEATURE report instead of a INPUT report, so that it matches the ManufacturerDate parameter in the HID descriptor. This is also required in order for the date to be picked up on Windows.

Author: forderud

src/HIDPowerDevice.cpp

@@ -251,7 +251,7 @@ void HIDPowerDevice_::end(void) {
 
 int HIDPowerDevice_::sendDate(uint16_t id, uint16_t year, uint8_t month, uint8_t day) {
     iManufacturerDate = (year - 1980)*512 + month * 32 + day; // from 4.2.6 Battery Settings in "Universal Serial Bus Usage Tables for HID Power Devices"
-    return HID().SendReport(id, &iManufacturerDate, sizeof(iManufacturerDate));
+    return HID().SetFeature(id, &iManufacturerDate, sizeof(iManufacturerDate));
 }
 
 int HIDPowerDevice_::sendReport(uint16_t id, const void* bval, int len) {