Hi ,
please have a look to the services provided in package SABP_CONVERT.
For you are the services of CL_ABAP_TIMEFM interesting especially CL_ABAP_TIMEFM=>CONV_TIME_EXT_TO_INT/CONV_TIME_INT_TO_EXT
This thread is quite old, but may be interesting for people working with web search engines.
Tags: USR01, XUTIMEFM
Regards, Jürgen