Lack of hardware clock on Raspberry Pi is not that big of a deal if you are online all the time. For a few $ you can add this feature to your pi.
I ordered mine on eBay for less than $2, so I can recommend the seller here:
New DS3231 Precision RTC Module Memory Module for Arduino Raspberry Pi
RTC module is quite small, smaller than I thought it would be:
It also fits perfectly in my Raspberry Pi case.
Now for the configuration part:
# Load the module modprobe i2c-bcm2708 # use -0 for Model A or -1 for Model B echo ds3231 0x68 | tee/sys/class/i2c-adapter/i2c-1/new_device # Test RTC module hwclock
Wed 15 Mar 2000 08:39:04 AM CET -0.469524 seconds
hwclock -w Mon 18 May 2015 05:40:57 PM CEST -0.784936 seconds
echo ds3231 0x68 > /sys/class/i2c-adapter/i2c-1/new_device hwclock -s
update-rc.d ntp disable update-rc.d fake-hwclock disable
ntpd -gq hwclock -w