GetDateFormatEx returns a non-zero value but the buffer returned by it is faulty

Question

This is the sample program in which "GetDateFormatEx" returns an invalid string. It is failing in customer's setup.

#include <windows.h>
#include <iostream>
uint64_t
shimTime(void)
{
    FILETIME ts;
    GetSystemTimeAsFileTime(&ts);
    ULONGLONG systime = ((ULARGE_INTEGER*)&ts)->QuadPart;
    return systime;
}
int main() {
    static const size_t sz = 64;
    TCHAR currTimeStr[sz];
    TCHAR currDateStr[sz];
    FILETIME ts;
    int ret = -1;
    // Get current-time in pretty-format
    GetSystemTimeAsFileTime(&ts);
    uint64_t currTime = shimTime();
    SYSTEMTIME  stime, lstime;
    if (currTime == 0) {
        printf("currTime is 0\n");
        swprintf_s(currTimeStr, sz, L"0");
        swprintf_s(currDateStr, sz, L"0");
    }
    else {
        if (!FileTimeToSystemTime((FILETIME*)&currTime, &stime)) {
            printf("Unable to get FileTimeToSystemTime, err=%u\n", GetLastError());
        }
        if (!SystemTimeToTzSpecificLocalTime(NULL, &stime, &lstime)) {
            printf("Unable to get SystemTimeToTzSpecificLocalTime, err=%u\n", GetLastError());
        }
        ret = GetTimeFormatEx(LOCALE_NAME_USER_DEFAULT, 0, &lstime, NULL, currTimeStr, _countof(currTimeStr));
        printf("GetTimeFormatEx ret = %d\n", ret);
        if (!ret) {
            printf("GetTimeFormatEx failed, err=%u\n", GetLastError());
        }
        ret = GetDateFormatEx(LOCALE_NAME_USER_DEFAULT, 0, &lstime, L"ddd',' MMM dd',' yyyy", currDateStr, _countof(currDateStr), NULL);
        printf("GetDateFormatEx ret = %d\n", ret);
        if (!ret) {
            printf("GetDateFormatEx failed, err=%u\n", GetLastError());
        }
    }
    currTimeStr[sz - 1] = '\0';
    currDateStr[sz - 1] = '\0';
    // Print time and date
    printf("Current time is: %S\n", currTimeStr);
    printf("Current date is: %S\n", currDateStr);
    char cp[1024];
    int cursize = sprintf_s(&cp[0], 1023, "ts=%S %S", currTimeStr, currDateStr);
    if (cursize < 0 || cursize >= 1023) {
        printf("Error occurred during sprintf_s, cursize: %u\n", cursize);
    }
    printf("%s\n", cp);
    return 0;
}

All I can see from log is cursize from sprint_f returned is 429496729 and the last print returns "ts=06:21:20 " None of the functions have failed. All are returning non zero values. currDateStr seems to be faulty but GetDateFormatEx has returned a non-zero value.

Details of the system

`C:\>systeminfo
 
Host Name:                 MIGNT006
OS Name:                   Microsoft Windows Server 2019 Standard
OS Version:                10.0.17763 N/A Build 17763
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Member Server
OS Build Type:             Multiprocessor Free
Registered Owner:          Flex
Registered Organization:   Flex
Product ID:                00429-70000-00000-AA322
Original Install Date:     01/30/2021, 17:11:12
System Boot Time:          01/19/2024, 14:52:23
System Manufacturer:       HP
System Model:              ProLiant DL360 G7
System Type:               x64-based PC
Processor(s):              2 Processor(s) Installed.
                           [01]: Intel64 Family 6 Model 44 Stepping 2 GenuineIntel ~177 Mhz
                           [02]: Intel64 Family 6 Model 44 Stepping 2 GenuineIntel ~177 Mhz
BIOS Version:              HP P68, 05/21/2018
Windows Directory:         C:\WINDOWS
System Directory:          C:\WINDOWS\system32
Boot Device:               \Device\HarddiskVolume1
System Locale:             en-us;English (United States)
Input Locale:              en-us;English (United States)
Time Zone:                 (UTC+02:00) Jerusalem
Total Physical Memory:     16,374 MB
Available Physical Memory: 5,051 MB
Virtual Memory: Max Size:  18,806 MB
Virtual Memory: Available: 7,398 MB
Virtual Memory: In Use:    11,408 MB
Page File Location(s):     C:\pagefile.sys
Domain:                    europe.ad.flextronics.com
Logon Server:              \\EUMIG002
Hotfix(s):                 31 Hotfix(s) Installed.
                           [01]: KB5033911
                           [02]: KB4486153
                           [03]: KB4535680
                           [04]: KB4549947
                           [05]: KB4561600
                           [06]: KB4562562
                           [07]: KB4589208
                           [08]: KB4598480
                           [09]: KB4601393
                           [10]: KB5000859
                           [11]: KB5003243
                           [12]: KB5003711
                           [13]: KB5005112
                           [14]: KB5034127
                           [15]: KB5006754
                           [16]: KB5008287
                           [17]: KB5009642
                           [18]: KB5011574
                           [19]: KB5012675
                           [20]: KB5014031
                           [21]: KB5014797
                           [22]: KB5015896
                           [23]: KB5017400
                           [24]: KB5020374
                           [25]: KB5023789
                           [26]: KB5028316
                           [27]: KB5030505
                           [28]: KB5031589
                           [29]: KB5032306
                           [30]: KB5034863
                           [31]: KB5005701
Network Card(s):           4 NIC(s) Installed.
                           [01]: HP NC382i DP Multifunction Gigabit Server Adapter
                                 Connection Name: Ethernet 3
                                 Status:          Media disconnected
                           [02]: HP NC382i DP Multifunction Gigabit Server Adapter
                                 Connection Name: Ethernet 4
                                 DHCP Enabled:    No
                                 IP address(es)
                                 [01]: 10.229.8.6
                           [03]: HP NC382i DP Multifunction Gigabit Server Adapter
                                 Connection Name: Ethernet 2
                                 Status:          Media disconnected
                           [04]: HP NC382i DP Multifunction Gigabit Server Adapter
                                Connection Name: Ethernet
                                 Status:          Media disconnected
Hyper-V Requirements:      VM Monitor Mode Extensions: Yes
                           Virtualization Enabled In Firmware: Yes
                           Second Level Address Translation: Yes
                           Data Execution Prevention Available: Yes
`

Can you please help in figuring out what could be possibly wrong here?