A basic datetime module in zig
datetime: any formatter
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build.zig.zon
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build.zig.zon
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src/datetime.zig
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src/datetime.zig
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return self._format(DefaultFormat, writer);
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}
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pub fn formatNumber(self: Self, writer: *std.Io.Writer, options: anytype) std.Io.Writer.Error!void {
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_ = options;
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return writer.print("{d}", .{self.toTimestamp()});
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}
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/// To format as a timestamp.
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/// Usage: std.fmt.alt(yourTimestamp, .timestampFormatter)
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pub fn timestampFormatter(self: Self, writer: *std.Io.Writer) std.Io.Writer.Error!void {
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return writer.print("{d}", .{self.toTimestamp()});
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}
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const Formatter = struct {
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dtval: Self,
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fmt: []const u8,
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pub inline fn format(self: @This(), writer: *std.Io.Writer) std.Io.Writer.Error!void {
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try self.dtval._format(self.fmt, writer);
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}
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};
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pub fn formatter(self: Self, fmt: []const u8) Formatter {
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return .{ .dtval = self, .fmt = fmt };
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}
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/// Formatting using our own simple format string.
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try std.testing.expectEqualStrings("1737478323", try std.fmt.bufPrint(&buf, "{d}", .{a1}));
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}
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test formatter {
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const a1 = fromTimestamp(1737478323);
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var buf: [128]u8 = undefined;
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var writer: std.Io.Writer = .fixed(&buf);
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try writer.print("{f}", .{a1.formatter("Y H S")});
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try std.testing.expectEqualStrings("2025 16 03", writer.buffered());
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}