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best way to convert UTC to local time?

I am trying to write a script which will sort files into sub-folders based on the date that the file was _added_ to the current folder it is in.

This is what I have come up with:

	zmodload zsh/datetime

	for F in "$@"

			# if the input IS NOT a file (i.e. is a link or directory), skip it
		[[ -f "$F" ]] || continue

# see if the input from the user is readable, if not, go on to the next one
		[[ -r "$F" ]] || continue

			# look for Spotlight metadata for "Date Added" (kMDItemDateAdded)
			# This will be something like "2013-06-08 02:46:38 +0000"
		DATE_ADDED_UTC=$(mdls -raw -name kMDItemDateAdded "$F")

# if we get '(null)' then the metadata doesn't exist. Which shouldn't happen. But might.
		[[ "$DATE_ADDED_UTC" == "(null)" ]] && continue

# If we get here, we have the date added, but that date is based on UTC time,
			# not local time (currently EDT), so we need to convert it.
			# convert that timestamp to seconds-since-epoch
			# this will give us something like '1370677598'
DATE_ADDED_UTC_EPOCH=$(TZ=UTC strftime -r "%Y-%m-%d %H:%M:%S +0000" "$DATE_ADDED_UTC")

			# convert that 'seconds-since-epoch' to a local time
			# 2013-06-08
		DATE_ADDED_LOCAL=$(strftime "%Y-%m-%d" "$DATE_ADDED_UTC_EPOCH")

		echo "The file $F was added on $DATE_ADDED_LOCAL"


This works, but three separate `strftime` calls seems inefficient. I mean, it's not like it takes a long time to run or anything, I'm just wondering if there's a "better" way.


p.s. - as far as I know there's no other way to get the "Date Added" info. If I'm wrong, please let me know :-)

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