43 lines
1.1 KiB
Zig
43 lines
1.1 KiB
Zig
const std = @import("std");
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pub fn parseDateTime(datetime: []const u8) ?f64 {
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const time_h = @cImport({
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@cDefine("_XOPEN_SOURCE", "700");
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@cInclude("stddef.h");
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@cInclude("stdio.h");
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@cInclude("time.h");
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@cInclude("timegm.h");
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});
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var buffer: [256]u8 = undefined;
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var fba = std.heap.FixedBufferAllocator.init(&buffer);
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var allocator = fba.allocator();
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const datetime_z = allocator.dupeZ(u8, datetime) catch return null;
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var tm: time_h.tm = .{};
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const s = time_h.strptime(datetime_z, "%Y-%m-%dT%H:%M:%S.", &tm);
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if (s == null) {
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return null;
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}
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const s_len = std.mem.len(s);
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if (s[s_len-1] != 'Z') {
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return null;
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}
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const milliseconds_str = s[0..(s_len-1)];
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var milliseconds: f64 = @floatFromInt(std.fmt.parseUnsigned(u32, milliseconds_str, 10) catch return null);
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while (milliseconds >= 1) {
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milliseconds /= 10;
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}
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const seconds: f64 = @floatFromInt(time_h.my_timegm(&tm));
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return seconds + milliseconds;
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}
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test "parse date time" {
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try std.testing.expectEqual(1723069394.105, parseDateTime("2024-08-07T22:23:14.105Z").?);
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}
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