All the two phrases, "in time of" and " in times of" are in use on the Internet. But I can not distinguish between them correctly. Here are some examples I have come across:
How did Hawkwood make money in times of peace? New Concept English, Vol 3, Lesson 14.
A Prayer In Time of Trouble, www.iocc.org/pdffiles/prayeradslick.pdf.
Can anyone tell me the differences between the two phrases?