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COMMENT(!MOD!zsh/datetime
Some date/time commands and parameters.
!MOD!)
The tt(zsh/datetime) module makes available one builtin command:

startitem()
findex(strftime)
cindex(date string, printing)
xitem(tt(strftime) [ tt(-s) var(scalar) ] var(format) [ var(epochtime) [ var(nanoseconds) ] ] )
item(tt(strftime) tt(-r) [ tt(-q) ] [ tt(-s) var(scalar) ] var(format) var(timestring) )(
Output the date in the var(format) specified.  With no var(epochtime), the
current system date/time is used; optionally, var(epochtime) may be used to
specify the number of seconds since the epoch, and var(nanoseconds) may
additionally be used to specify the number of nanoseconds past the second
(otherwise that number is assumed to be 0).
See manref(strftime)(3) for details.  The zsh extensions described in
ifzman(the section EXPANSION OF PROMPT SEQUENCES in zmanref(zshmisc))\
ifnzman(noderef(Prompt Expansion)) are also available.

startitem()
item(tt(-q))(
Run quietly; suppress printing of all error messages described below.
Errors for invalid var(epochtime) values are always printed.
)
item(tt(-r))(
With the option tt(-r) (reverse), use var(format) to parse the input
string var(timestring) and output the number of seconds since the epoch at
which the time occurred.  The parsing is implemented by the system
function tt(strptime); see manref(strptime)(3).  This means that zsh
format extensions are not available, but for reverse lookup they are not
required.

In most implementations of tt(strftime) any timezone in the
var(timestring) is ignored and the local timezone declared by the tt(TZ)
environment variable is used; other parameters are set to zero if not
present.

If var(timestring) does not match var(format) the command returns status 1
and prints an error message.  If var(timestring) matches var(format) but
not all characters in var(timestring) were used, the conversion succeeds
but also prints an error message.

If either of the system functions tt(strptime) or tt(mktime) is not
available, status 2 is returned and an error message is printed.
)
item(tt(-s) var(scalar))(
Assign the date string (or epoch time in seconds if tt(-r) is given) to
var(scalar) instead of printing it.
)
enditem()

Note that depending on the system's declared integral time type,
tt(strftime) may produce incorrect results for epoch times greater than
2147483647 which corresponds to 2038-01-19 03:14:07 +0000.
)
enditem()

The tt(zsh/datetime) module makes available several parameters;
all are readonly:

startitem()
vindex(EPOCHREALTIME)
item(tt(EPOCHREALTIME))(
A floating point value representing the number of seconds since
the epoch.  The notional accuracy is to nanoseconds if the
tt(clock_gettime) call is available and to microseconds otherwise,
but in practice the range of double precision floating point and
shell scheduling latencies may be significant effects.
)
vindex(EPOCHSECONDS)
item(tt(EPOCHSECONDS))(
An integer value representing the number of seconds since the
epoch.
)
vindex(epochtime)
item(tt(epochtime))(
An array value containing the number of seconds since the epoch
in the first element and the remainder of the time since the epoch
in nanoseconds in the second element.  To ensure the two elements
are consistent the array should be copied or otherwise referenced
as a single substitution before the values are used.  The following
idiom may be used:

example(for secs nsecs in $epochtime; do
  ...
done)

)
enditem()
debug log:

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