Alternative to colon in a time format

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ISO 8601 recommends to following format for a date and time:

2014-12-29T16:11:20+00:00

I'm rather fond of this format since it allows for lexical ordering. But there is a small problem: some file systems don't allow colons in file names (at least not normally). ISO 8601 does allow for omitting the colons, but I would rather have some symbol there than have the numbers run together:

2014-12-29T161120+0000

Does ISO 8601 allow for a symbol other than colons? I couldn't find any indication that it does. If not, is there another well recognized symbol I could use? (Perhaps another standard proposes such a symbol?)

asked 44 secs ago

jpmc26

3,955

Alternative to colon in a time format