Zig

Compute Difference Between Two DateTime Strings

Demonstrates how to compute the difference between two datetime strings. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Imagine we have these strings:

    const t1 = "2022-11-14 15:45:38";
    const t2 = "2022-11-16 17:23:41";

    // How many minutes are between the two?

    // First, we'd want load each date/time into a Chilkat CkDateTime object.
    // In this case, there are no CkDateTime methods that accept the above format.
    // However.. the CkDateTime's SetFromTimestamp will accept a date in the format "YYYY-MM-DDThh:mm:ssZ"

    // First modify the above dates to the timestamp format.
    const sb1 = try chilkat.StringBuilder.init();
    defer sb1.deinit();
    sb1.append(t1) catch {};
    var count: i32 = sb1.replace(" ", "T");
    sb1.append("Z") catch {};

    const sb2 = try chilkat.StringBuilder.init();
    defer sb2.deinit();
    sb2.append(t2) catch {};
    count = sb2.replace(" ", "T");
    sb2.append("Z") catch {};

    // Load each into a CkDateTime
    const dt1 = try chilkat.DateTime.init();
    defer dt1.deinit();
    dt1.setFromTimestamp(try sb1.getAsString(alloc)) catch {};
    // verify...
    std.debug.print("{s}\n", .{try dt1.getAsTimestamp(alloc, false)});

    const dt2 = try chilkat.DateTime.init();
    defer dt2.deinit();
    dt2.setFromTimestamp(try sb2.getAsString(alloc)) catch {};
    // verify...
    std.debug.print("{s}\n", .{try dt2.getAsTimestamp(alloc, false)});

    // Get the difference in seconds
    const diff_seconds = dt2.diffSeconds(dt1);
    std.debug.print("Difference in seconds: {d}\n", .{diff_seconds});
    std.debug.print("Difference in minutes: {d}\n", .{@divTrunc(diff_seconds, 60)});
}