Where to find time.h library for STM32

[Konami]

I'm looking to implement an RTC on the STM32F411 and with an STM32L083 and would like to use a time library (mostly) for converting between date/time and epoch time. Does ST provide these libraries or can I find them somewhere?

[Tesla DeLorean]

No, time.h is usually something to your tool vendor, most embedded tool chains have a mechanism to implement chip/board specific RTC interfacing.

http://www.keil.com/support/man/docs/armlib/armlib_chr1359122848748.htm