![]() ![]() Most programming languages have libraries to help you converting time zones, calculating by hand might not be a good idea because of the variety of time zones en daylight saving times. This means you might have convert time zones to calculate timestamps. $ zsh -c 'zmodload zsh/datetime strftime %FT%T.%6. There is only one Unix time and it is created by using the UTC/GMT time zone. You can also convert milliseconds to date & time and the other way around. ![]() ![]() Ksh93 (and zsh's strftime builtin) support subsecond, not bash yet: $ ksh -c 'printf "%(%FT%T.%6N%z)T\n" 1234567890.123456789' 18:36:12 11:36:12 Genesis & History This site provides the current time in milliseconds elapsed since the UNIX epoch (Jan 1, 1970) as well as in other common formats including local / UTC time comparisons. If you use something like DateTime.LocalNow () to return the current time, then convert that to Epoch Time using the following formula: Duration.TotalSeconds (DateTime.LocalNow () - datetime (1970,1,1,0,0,0)) Your PC will have your local time with proper offsets from UTC. (Unix time ignores leap seconds and therefore does not truly represent UTC.) Note: If the time zone of D is not specified, then convertTo treats the values in D as UTC times, not local times. $ TZ=Europe/London ksh93 -c 'printf "%(%c)T\n" "#0"' Unix time, also known as UNIX Epoch time or POSIX time, is the system for measuring time with respect to the Unix epoch. For instance, in mainland Britain, it was summer time all year in 1970, but: $ TZ=Europe/London bash -c 'printf "%(%c)T\n" 0' Ksh93 however seems to use its own algorithm for the timezone and can get it wrong. In ksh93 however, the argument is taken as a date expression where various and hardly documented formats are supported.įor a Unix epoch time, the syntax in ksh93 is: printf '%(%FT%T%z)T\n' '#1234567890' In the example shown, the formula in C5 is: (B5 / 86400) + DATE (1970,1,1) Generic formula (A1 / 86400) + DATE (1970,1,1) Explanation The Unix time stamp tracks time as a running count of seconds. (where %FT%T%z is the strftime()-type format, here using standard unambiguous format which includes the UTC offset ( %z)) To convert a Unix timestamp to Excel's date format, you can use a formula based on the DATE function. ![]()
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