**Background:** I have groups of files in their own directory which I merge into one file in order of their filename. I call them `t1.txt, t2.txt, t3.txt...` I merge them in order of the integer.

**Situation:** For various reasons, I want to get away from the filename as the metadata for later file merge ops. 

**Action:** I'm thinking of moving to a file merging system that orders the file merge by the *date/time of the file creation* (obviously, I'll have to create the files in order of later merge).

**Question:** 

1. Will date/time sorted file merging be reliable? Are there hidden gothchas? Some of the files will be created only tenths of a second apart, or less--is this an achilles heal?
2. Is there something different I should consider for ordering merges.

Date/time seems elementary to me. OTH, what seems simple and straight forward at first often ends up being more complicated than envisioned. So I ask.