How do I compare different times?

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Variable var_time1 = 13:00
Variable var_time2 = 17:00
if var_time1 <var_time2 and its 17:15 then switch on xyz
How to convert between time and text variables?

Thanks for an answer

@pima2235 http://forum.pimatic.org/topic/584/how-to-make-user-configurable-start-and-stop-times-in-pimatic/5

@ koffienl Thanks for this link. I look at it myself and try it for my project to implement. A conversion of times in String is not possible. Thank you.
P.S. This text is translated automatically.