val now : unit -> Ptime.t
val period : unit -> Ptime.span option
period () is a positive POSIX time span representing the clock's period (if available).
val current_tz_offset_s : unit -> Ptime.tz_offset_s option
current_tz_offset_s () is the system's current local time zone offset to UTC in seconds, if known. This is the duration local time - UTC time in seconds.
period_d_ps () is if available
Some (d, ps) representing the clock's picosecond period
d * 86'400e12 +
ps is in the range [
Sys_error whenever they can't determine the current time or that it doesn't fit in
Ptime's well-defined range. This exception should only be catched at the toplevel of your program to log it and abort the program. It indicates a serious error condition in the system.
All the other functions, whose functionality is less essential, simply silently return
None if they can't determine the information either because it is unavailable or because an error occured.