Your own voice is probably the best choice to remind you the time. It is in the human nature that we like our own voices because as psychologies say every healthy person likes herself/himself. We of course usually like voices of our close friends also. Women may even prefer to receive your voice for date/time announcement rather than you photo because it is scientifically proved that women prefer to hear rather than see.
In Your Voice Reminder to record your voice for the time reminding is as easy as to say 28 words and requires about the same time. It is because all, including microphone enabling, volume control, noise reduction and trimming silence at the end of the phrases, is automatic. All you need is microphone but most laptops have build in microphone and most desktops the sockets to plug them in. Besides, microphones are not expensive. Reasonably good quality may be archived with the devices with USB microphones, which prices start from $20.
Your Voice Reminder builds time announcements from chunks. For example to say
It is the reason why you need to record only 28 chunks to get time announcement for any time with the minute precision.
To get impression how easy to record your voice for the time / date announcement, please, look at the recording dialog below. As you see, "It Is" has already been recorded. "Twelve" is going to be recorded and only 27 words left. Go ahead!