The way I would teach time in Spanish is to show my students an example of the clock in English and show them the same clock only in Spanish then I would make them solve the rest of the problem with the information of Spanish numbers that they know. I also would use hints of what stay the same and what changes.
1:00= es la una
1:10pm= Es la una de la tarde
1:10am= Es la una y diez de la mañana
2-12= son las dos-doce
see I leave a hint to leave the"es la"(only use this for one) by bolding it and I also bold "de la""son las"(use for 2-12) and "y ___ de la". I would also put pictures and explain more that once.